Technical Guide for Adding XenDesktop 4 to an Existing XenApp 5 Environment

Technical Guide for Adding XenDesktop 4 to an Existing XenApp 5 Environment Citrix Systems released XenDesktop 4 on November 16, 2009. This document provides technical insights related to adding XenDesktop 4 to an existing XenApp environment. In addition to easy-to-follow installation steps, this document includes several sample scenarios. It should serve as a technical guide for Citrix administrators and partners. Author: Jo Harder, Citrix Worldwide Technical Readiness Date Created: December 2009 www.citrix.com

Table of Contents Introduction 3 XenDesktop 4 FlexCast Delivery Technology...3 Existing XenApp + New XenDesktop...4 Existing XenApp Architecture...4 Upgrade vs. Migration...5 Licensing...5 Reusing XenApp Components/Features 6 Additional Technical Considerations...9 Installing XenDesktop Virtual Desktops Where XenApp Infrastructure Exists 11 Sequential Installation Order for XenDesktop Virtual Desktops: Easy as 1-2-3-4!...11 Adding Provisioning Services to Support XenDesktop...12 Adding EdgeSight for Virtual Desktops...13 Deployment Scenarios 14 Scenario #1: Adding Virtual Desktops to Address New Call Center Users...14 Scenario #2: Adding VM Hosted Apps on PC Blades to Support a Resource-Intensive App...20 Page 2

Introduction On November 16, 2009, Citrix released XenDesktop 4. Citrix XenDesktop is a desktop virtualization solution that delivers Microsoft Windows desktops as an on-demand service to any user, anywhere. XenDesktop 4 Enterprise and Platinum editions include XenApp functionality, and customers that purchase XenDesktop VDI edition licenses or those that take advantage of the XenDesktop Trade-Up program may wish to retain their existing XenApp infrastructure and add XenDesktop functionality. To facilitate adding XenDesktop to an existing XenApp infrastructure, this guide contains the following sections: Reusing XenApp Components/Features Installing XenDesktop Where XenApp Infrastructure Exists Deployment Scenarios XenDesktop 4 FlexCast Delivery Technology XenDesktop 4 introduced FlexCast delivery technology. To the IT professional, this means that there are six options for delivering desktop resources to users: Type Description Example Hosted Shared Desktops Hosted VM-based VDI Desktops Hosted Blade PC Desktops Local Streamed Desktops Virtual Apps to Installed Desktops Local VM-based Desktops Locked down desktops based on a shared server Personalized Windows desktops based on a virtualized desktop Personalized Windows desktops based on a blade PC Local desktops based on a streamed image Virtual apps accessed by a client device Virtualized desktops that can be accessed offline XenApp published desktop Virtualized desktops hosted on XenServer Desktops hosted on blade PCs Local desktops streamed by means of Provisioning services VM Hosted Apps XenClient Page 3

Existing XenApp + New XenDesktop Organizations may require more than one of the FlexCast delivery technologies described above. Because many organizations may have needs for both application virtualization and desktop virtualization based on distinct business and technical requirements, what has traditionally been known as both XenApp and XenDesktop farms may be required to address those requirements. As such, this document focuses on those administrators that have existing XenApp environments and wish to add XenDesktop functionality. From the user perspective, users that have been authorized to use both XenApp and XenDesktop resources can access both from a Web Interface site or the Start Programs menu. Later in this document, several sample scenarios are presented so that the IT professional has a better understanding of the implementation steps and the reasons why those steps are undertaken. Specifically, the following sample scenarios are explored: Scenario Adding XenDesktop to a XenApp environment to address desktop virtualization requirements for a specific group of users Adding XenDesktop to a XenApp environment to address application virtualization requirements for a specific application Example Call center users will access virtualized desktops A resource-intensive application that is not compatible with any Windows Server platform will be hosted on PC blades and accessed as VM Hosted Apps through XenApp Existing XenApp Architecture For the purposes of this document, references to XenApp are based on one of the following: Presentation Server 4.5 XenApp 5 for Windows Server 2003 XenApp 5 for Windows Server 2008 Citrix strongly recommends upgrading to XenApp 5 Feature Pack 2; however, notations will be provided within this document where the most recent feature or component is recommended or required. For information regarding upgrading or migrating to XenApp 5 Feature Pack 2, please see CTX122303 for more information. Page 4

Upgrade vs. Migration Within this document, there is a distinction between the terms upgrade and migration as defined below: Upgrade: installing a newer version of a feature or release over an existing version Migration: a clean, new installation of that feature or release Licensing This document assumes the use of the XenDesktop Platinum edition. This guide discusses the technical aspects of the Citrix License Server but does not incorporate Microsoft licensing requirements. Please consult Microsoft licensing documentation. Page 5

Reusing XenApp Components/Features The following components or features can be reused for XenDesktop deployments: XenApp Component Active Directory Reusability Designate a new OU where XenDesktop functionality will be housed. This can either be a child OU of a parent OU that contains other Citrix components or a new OU. The designated OU will be assigned a Service Connection Point for Virtual Desktop Agent registration; it will not contain any Desktop Delivery Controllers. Where Citrix Profile management is implemented, a sister OU enables the same profile to apply to both XenApp and XenDesktop where enabled as part of the parent OU. License Server If reusing the existing Citrix License Server, do not install a new Citrix License Server during XenDesktop installation. The Citrix License Server must be based on version 11.6.1; build 9019 will function, although build 9020 is strongly recommended. Upgrade if necessary. Ensure that the startup license (as downloaded from My Citrix) is dated November 16, 2009, or later. Delete any startup licenses prior to that date. Add XenDesktop licenses to the existing Citrix License Server. If appropriate, delete extraneous license files. Designate the existing Citrix License Server in the XenDesktop Delivery Services Console (Farm Properties License Server). Database server Add a database instance for the XenDesktop data store to the existing SQL Server or Oracle database server. During the Desktop Delivery Controller installation, designate the existing database server when prompted. If a new Provisioning services farm will be implemented, designate a SQL Server database instance for this purpose as well. Page 6

XenApp Component Management consoles Reusability The Delivery Services Console (formerly known as the Access Management Console) can be consolidated within a custom MMC to administer both XenApp and XenDesktop farms. Any other MMC-based management consoles can also be consolidated within a custom MMC. If Web Interface is installed on that server, it too can be consolidated into a custom MMC. Note that the Web Interface MMC is only installed in conjunction with Web Interface and is thus the Web Interface MMC is not available as a standalone installation. The Advanced Configuration Console/Presentation Server Console servicing XenApp and XenDesktop farms cannot be accessed from the same server because both use distinct versions of the same executable (ctxload.exe). Web Interface If presenting both XenApp applications and XenDesktop resources through the same Web Interface site is desired, do not install Web Interface during XenDesktop installation (command line setup.exe nosites). For this purpose, Web Interface must be based on version 5.2; if necessary, upgrade to this version. If XenDesktop resources will be located from a distinct Web Interface site, install Web Interface as part of the XenDesktop installation. Where Zone Preference and Failover is used for XenApp application availability, Web Interface User Roaming functionality can be configured within the WebInterface.conf file to address XenDesktop failover requirements. XenApp published applications (streamed or hosted) Hosted or streamed applications can be made available through XenDesktop. Enabling these applications by means of a Web Interface Services site--as presented to the user within the Start All Programs menu--generally provides the most transparent means for user access. Where applications will be streamed to the virtual desktops, pre-caching the applications should be considered for faster startup. Page 7

XenApp Component Profile management WAN Optimization Service monitoring Provisioning services Reusability If Citrix Profile management is implemented for the XenApp servers based on v1 (Windows Server 2003) or v2 (Windows Server 2008) platforms, consider the new XenDesktop operating system platform and Active Directory OU structure. For example, users accessing Citrix profiles based on XenApp 5 for Windows Server 2008 (v2) and XenDesktop based on Windows 7 (v2) under the same parent OU can successfully utilize the same user profile, whereas users accessing Citrix profiles based on XenApp 5 for Windows Server 2003 (v1) and XenDesktop based on Windows 7 (v2) under the same parent OU cannot successfully utilize the same user profile. HDX IntelliCache (ICA Acceleration) benefits achieved with Branch Repeater 5.5 (and higher) and XenApp 5 for Windows Server 2003 (HRP4 and higher) is likewise built into XenDesktop 4. ICA traffic is automatically optimized based on these prerequisites, and no configuration or changes are necessary. Service Monitoring (Citrix EdgeSight technology) can be used in the same manner as the physical desktop deployment. Each XenDesktop virtual desktop requires the installation of the Service Monitoring for Virtual Desktop Agent. Enabling XenDesktop functionality for an existing XenApp Service Monitoring implementation requires the addition of the EdgeSight Agent database server in order to capture data from pooled virtual desktops prior to being redeployed. Provisioning services should be used to provision virtual desktop images. Where possible, minimize the number of virtual desktop images in order to facilitate easy management. Although XenApp avails multiple Zone Data Collectors to support large sites, XenDesktop requires distinct farms because there is only one farm master. In addition, bandwidth constraints and SQL Server replication generally cannot effectively support multiple locations; thus, consideration should be given to creating a XenDesktop farm and corresponding Provisioning Services farm for each site. Citrix Online plug-in Citrix Online plug-in version 11.2 is required where both XenApp and XenDesktop will be accessed from the same physical client device. If necessary, upgrade the client software to this version. Page 8

XenApp Component Reusability Single Sign-on EasyCall voice services Now that Single Sign-on (Password Manager) is included with XenDesktop Platinum, password management on XenDesktop devices can be used in the same manner as the physical desktop deployment that has been available with XenApp Platinum. Thus, the Single Sign-on agent must be installed on each virtual desktop. EasyCall can be used in the same manner as the physical desktop deployment. The EasyCall plug-in must be installed on the XenDesktop virtual image. Citrix Receiver The Citrix Receiver plug-in should be pre-installed as part of the XenDesktop image. Citrix Receiver can be used in the same manner as the physical desktop deployment. No changes to the Merchandising Server are required; however, administrators may wish to assess the agents and/or plug-ins that are required for XenDesktop as the full set would not likely be required. Additional Technical Considerations When installing a new XenDesktop farm within an environment where XenApp already exists, consider the following: Aspect Port 8080 Description XenDesktop uses TCP port 8080 for communications between virtual desktops and the Desktop Delivery Controller. Where TCP port 80 is not shared with IIS for Web Interface Citrix XML Service communications, port 8080 is sometimes selected. In addition, the Citrix License Server prior to 11.6.1 build 9020 may have port 8080 conflicts; upgrading to Citrix License Server 11.6.1 build 9020 addresses potential port 8080 conflicts. Thus, XenDesktop Desktop Delivery Controllers, Web Interface, XenApp Data Collectors, and Citrix License Server communications should be validated to ensure that no conflicts exist with TCP port 8080 traffic. Page 9

Citrix policies VM Hosted Apps Redundancy and failover HDX MediaStream for Flash Hypervisor Operating System platform Where Citrix policies, such as drive mappings, are configured for a XenApp farm, these policies also need to be configured within the XenDesktop farm. Citrix policies are only applicable to the farm where configured, and XenApp policies do not extend to a XenDesktop farm. Although accessed through a XenApp 5 for Windows Server 2003 farm, VM Hosted Apps resources are hosted and delivered using XenDesktop technology. The XenDesktop 4 media should be used for VM Hosted Apps functionality. When creating a Desktop Group, on the Assignment Type screen, select Use Desktop Group for VM Hosted Apps. In addition, modify the application icon and place the application shortcut item in the SeamlessInitialProgram folder. Lastly, keep in mind that only one application can be accessed as a VM Hosted App based on this functionality. Citrix recommends always incorporating redundancy. For example, multiple Web Interface servers should be deployed, not just a single Web Interface server. In addition, where failover is incorporated into a XenApp environment, such as by means of Zone Preference and Failover, similar functionality should be incorporated into the XenDesktop environment, such as by means of Web Interface User Roaming configuration. This technology improves Flash responsiveness within web sites and requires that the physical Windows device have Internet Explorer and Adobe Flash 10 installed locally and LAN-like connectivity (30 ms or less by default). Accessing Internet Explorer-based sites by means of a XenApp hosted application through XenDesktop virtual desktops is a double hop. In such a case HDX MediaStream for Flash will not function properly. XenDesktop is server agnostic and is supported on Citrix XenServer, Microsoft Hyper-V, or VMWare vsphere, platforms. Desktop Delivery Controller functionality, whether used to support VM Hosted Apps or XenDesktop 4, can only be installed on Windows Server 2003 SP2 or higher; it cannot be installed on the Windows Server 2008 platform. However, resources from XenApp 5 for Windows Server 2003, XenApp 5 for Windows Server 2008, and XenDesktop 4 farms can be consolidated by means of Web Interface. Page 10

Installing XenDesktop Virtual Desktops Where XenApp Infrastructure Exists Assuming that your XenApp infrastructure is fully functional and that existing components will be reused to the extent possible, this section describes the installation steps. For more details regarding these installation steps, please see the XenDesktop product documentation available from the Citrix edocs site. The steps below are based on XenApp 5 Feature Pack 2; if your environment is not at this level, please see the Technical Guide to Upgrading/Migrating to XenApp 5 Feature Pack 2. Sequential Installation Order for XenDesktop Virtual Desktops: Easy as 1-2-3-4! When adding XenDesktop to an existing XenApp 5 infrastructure, the following sequence should be followed: 1. Before installing XenDesktop: Ensure that Citrix Licensing Server is based on version 11.6.1 build 9020 and add XenDesktop licenses Ensure that Web Interface is based on version 5.2 Designate a database instance on the SQL Server or Oracle database server for the XenDesktop data store Ensure that client devices are based on the Citrix Online plug-in version 11.2 Designate an Active Directory OU for the Desktop Delivery Controller(s); optimally, this will be a sister OU of the XenApp servers OU if Citrix Profile management will be used 2. During installation of the XenDesktop Desktop Delivery Controller: If the XenDesktop Delivery Services and Presentation Server consoles will be administered on the Desktop Delivery Controller server, ensure that the Management Consoles option remains checked; otherwise deselect To avoid installation of Web Interface, use the command line syntax setup.exe nosites; do not simply deselect Web Interface within the installation interface Deselect Citrix License Server installation Designate a unique farm name during the installation; do not provide the same name as an existing XenApp farm Designate the XenDesktop edition purchased; do not select the XenApp edition in use Designate the SQL Server or Oracle database server that will house the XenDesktop data store When the Active Directory Configuration Wizard appears, designate the previously configured Active Directory OU 3. When creating virtual desktops: Page 11

Install the operating system and any desired applications, including the Citrix Online plug-in and Adobe Flash 10 if HDX Flash will be enabled Install Virtual Desktop Agent and ensure that the TCP port 8080 designation and Windows firewall changes do not conflict with internal security requirements Ensure that each virtual desktop is assigned a unique device name and IP address; Citrix Provisioning services automatically addresses this requirement 4. To configure and access XenDesktop: Within the XenDesktop Delivery Services Console, create desktop group(s) as appropriate Within Web Interface, add the XenDesktop farm as a server farm, and designate a Desktop Delivery Controller as a Citrix XML Service server Based on the instructions provided above, your new environment will have these characteristics: Adding Provisioning Services to Support XenDesktop Assuming that Provisioning services has already been deployed to support XenApp, no additional infrastructure is required to support virtualized or blade PC desktops. However, because there will be an increase in the number of virtual images, additional storage space should be allocated. Depending on your environment and network configuration, it is typically best to allocate a Provisioning services farm and associated database for each large data center where a XenDesktop farm will be deployed. As an example, Citrix internally has four sites where XenDesktop is deployed, and each site has its own XenDesktop farm, Provisioning services farm, and SQL Server database. Page 12

Adding EdgeSight for Virtual Desktops In order for EdgeSight to effectively support virtualized desktops, EdgeSight Agent database server functionality may be considered. The purpose of this additional server is to store data recorded on the virtual desktops during user sessions. By doing so, session data is retained even though the virtual desktop is deleted. Because each virtual desktop contributes to the size of the SQL Server database, additional storage space should be designated. The EdgeSight agent uses a local data store to record the performance and usage information that it collects. In a XenDesktop deployment where there is a common image for the XenDesktop virtual images, that data store is lost each time image is restarted because the image reverts to its initial state. Accordingly, there needs to be a location for a persistent agent data store, which is facilitated by means of the EdgeSight Agent database server. The EdgeSight database server can be an extra virtual machine on each host that uses few resources such that it does not impact the performance of the real virtual machine images that are also running on the host. EdgeSight manages all of the brokering and communication. The only incremental costs would be the operating system licenses for the EdgeSight Agent database server virtual machine(s), which can be based on client operating systems such as Windows XP or Windows 7. Based on incorporating EdgeSight for Virtual Desktops, your new environment will have these characteristics: Web Interface 5.2 EdgeSight Server EdgeSight Agent Database Server EdgeSight For Virtual Desktop Agents EdgeSight Agent communications database upload Physical client device with Citrix Online plug-in 11.2 Citrix License Server 11.6.1 Build 9020 EdgeSight for EndPoints XenDesktop DDC XenServer Hosting Virtual Desktops EdgeSight for XenApp SQL Server hosting XenApp and XenDesktop Data Stores and EdgeSight database XenApp Farm Page 13

Deployment Scenarios Two sample scenarios are discussed below in order to provide more specific guidance as to how the implementation of XenDesktop should be undertaken. Of course, every environment is unique, so the generalities discussed within this section may or may not apply to your organization. Scenario #1: Adding Virtual Desktops to Address New Call Center Users The Telephone Company is a regional telecommunications provider that uses XenApp 5 for Windows Server 2008 to host several strategic applications. Aside from core XenApp 5, Service Monitoring (EdgeSight) is deployed to monitor the XenApp environment. The CIO at the Telephone Company has reviewed the benefits of virtualized desktops and has decided to implement Windows 7 virtual desktops for a pilot group of 25 call center users. The call center group will not have access to the XenApp resources, and the XenApp users will not have access to the XenDesktop resources. However, the pilot environment should be configured so that future corporate users will have access to both XenApp and XenDesktop resources. As part of this transition, the necessary core infrastructure components will be upgraded as necessary, Service Monitoring (EdgeSight) functionality will be extended to the virtual desktops, and Provisioning services will be implemented to support both XenDesktop and XenApp. After gathering business and technical requirements from the stakeholders, the Citrix administrator is now ready to move forward with the XenDesktop implementation. Thus, the status before and after is as follows: Component Status Before Status After Changes XenDesktop None One XenDesktop 4 farm hosting virtual desktops based in the main data center Add XenDesktop farm based on XenServer Active Directory Domain.com Citrix XenApp Domain.com Citrix XenApp XenDesktop Add XenDesktop OU as a sister OU to the XenApp servers because Citrix Profile management is applied to the Citrix OU Page 14

Component Status Before Status After Changes License Server Version 11.5 Version 11.6.1 build 9020 Upgrade and add XenDesktop licenses Database server Clustered SQL Server 2005 with databases instances for: XenApp Data Store Clustered SQL Server 2005 with databases instances for: XenApp Data Store Add XenDesktop and Provisioning services database instances Configuration Logging Configuration Logging EdgeSight EdgeSight XenDesktop Data Store Provisioning services Page 15

Component Status Before Status After Changes Management consoles XenApp Access Management and Advanced Configuration consoles hosted on dedicated XenApp dedicated Zone Data Collector and Backup Zone Data Collector Web Interface console hosted on each Web Interface server License Management console hosted on Citrix License Server XenApp Access Management and Advanced Configuration consoles hosted on dedicated XenApp dedicated Zone Data Collector and Backup Zone Data Collector Web Interface console hosted on each Web Interface server License Management console hosted on Citrix License Server Adding XenDesktop management consoles to the Desktop Delivery Services Controller, which will be administered by a different administrator XenDesktop Delivery Services and Presentation Server consoles hosted on Desktop Delivery Controllers Web Interface XenApp Services site presented by Web Interface 5.0.1 XenApp Services site presented by Web Interface 5.2 Upgrade and add XenDesktop farm to server farm tab XenApp applications Five applications available to most corporate users Five applications available to most corporate users None Page 16

Component Status Before Status After Changes Profile management Terminal Services roaming profiles for XenApp users Terminal Services roaming profiles for XenApp users Citrix Profile management for call center group based on adding ADM template to Citrix OU Add Citrix Profile management for call center group Implemented under Citrix OU because future users will have access to both XenApp and XenDesktop farm resources WAN Optimization Not used as all users are located within one single site Not used as all users are located within one single site None Service Monitoring (EdgeSight) Version 5.2.1 enabled for XenApp servers Version 5.2.1 enabled for XenApp servers and XenDesktop virtual desktops Add Service Monitoring for Virtual Desktop agent to virtual desktop images Implement EdgeSight Agent database server to capture virtual desktop data where the persistence of data is required Provisioning services Not used Enabled for XenApp servers and XenDesktop virtual desktops Install Provisioning services and create images Citrix Online plug-in Single sign-on (Password Manager) Version 11.0 Version 11.2 Upgrade Not used Not used None Page 17

Component EasyCall voice services Citrix Receiver Status Before Status After Changes Not used Not used None Not used Not used None Page 18

Thus, the new environment will be implemented as follows: Page 19

Scenario #2: Adding VM Hosted Apps on PC Blades to Support a Resource- Intensive App The Engineering Firm is a 100-person engineering design enterprise that uses XenApp 5 for Windows Server 2003 Feature Pack 2 to host computer-aided design (CAD) applications. The IT Director has found that a new resourceintensive application named Intensive App has severely impacted the number of users that can effectively use XenApp-based applications. Rather than add more XenApp servers to the farm, she has decided to transition Intensive App to XenApp VM Hosted Apps functionality based on PC blades. Due to the sensitive nature of the CAD designs, engineers only have basic utilities installed locally on their laptop computers. Engineers currently access Intensive App by means of the Start Programs menu on their laptop computers, and the IT Director wants to make the transition to VM Hosted Apps transparent to the users. As part of this transition, the necessary core infrastructure components will be upgraded as necessary, Citrix Receiver and Branch Repeater will be implemented, and Provisioning services functionality will be extended to the PC blades. After gathering business and technical requirements from the stakeholders, the Citrix administrator is now ready to move forward with the XenDesktop implementation. Thus, the status before and after is as follows: Component Status Before Status After Changes XenDesktop None One XenDesktop 4 farm based on PC blades Add XenDesktop farm and configure Desktop Group using the VM Hosted Apps assignment type Active Directory Domain.com Citrix XenApp Domain.com Citrix XenApp Add XenDesktop OU as a sister OU to the XenApp servers XenDesktop License Server Version 11.6.1 build 9020 Version 11.6.1 build 9020 None Page 20

Component Status Before Status After Changes Database server SQL Server 2005 with databases instances for: XenApp Data Store SQL Server 2005 with databases instances for: XenApp Data Store Add XenDesktop database instance Configuration Logging Configuration Logging EdgeSight EdgeSight Provisioning services Provisioning services XenDesktop Data Store Management consoles XenApp Delivery Services and Advanced Configuration consoles hosted on a dedicated XenApp Zone Data Collector Web Interface console hosted on each Web Interface server License Management console hosted on Citrix License Server XenApp Delivery Services and Advanced Configuration consoles hosted on a dedicated XenApp Zone Data Collector Web Interface console hosted on each Web Interface server License Management console hosted on Citrix License Server Consolidate XenDesktop administrative consoles onto XenApp Zone Data Collector where feasible Install XenDesktop Delivery Services console on dedicated XenApp Zone Data Collector and create new MMC based on Citrix-related snap-ins Install XenDesktop Presentation Server console on XenDesktop Desktop Delivery Controller to administer Citrix policies and other administration Page 21

Component Status Before Status After Changes Web Interface XenApp Services site presented by Web Interface 5.2 XenApp Services site presented by Web Interface 5.2 When publishing the application, modify the application icon and place the application shortcut item in the SeamlessInitial Program folder XenApp applications Five applications available to most corporate users Five applications available to most corporate users None; Intensive App presented in same manner but accessed as a VM Hosted App Profile management Mandatory profiles with folder redirection Mandatory profiles with folder redirection None WAN Optimization Branch Repeater appliance version 4.5.3 installed in headquarters and Mexico City office Registry modified on XenApp servers to enable acceleration of RC128 ICA connections Branch Repeater appliance version 5.5 installed in headquarters and Mexico City and Buenos Aires offices Registry modified on XenApp servers to enable acceleration of RC128 ICA connections Upgrade Branch Repeater to version 5.5 or higher and add one Branch Repeater in Buenos Aires ICA Acceleration automatically enabled with XenDesktop 4 Service monitoring (EdgeSight) Not used Not used None Page 22

Component Status Before Status After Changes Provisioning services Enabled for XenApp servers Enable for PC blades Add images and monitor storage requirements Citrix Online plug-in Version 11.0 Version 11.2 De-install plugin and include as part of Citrix Merchandising Server Single Sign-on (Password Manager) EasyCall voice services Not used Not used None Not used Not used None Citrix Receiver Not used Enable Citrix Merchandising Server and deploy designated plug-ins Install Citrix Receiver on client devices Install Citrix Merchandising Server and enable deployment of Citrix Online plug-in and Dazzle plug-in Page 23

hp bc2800 hp bc2800 hp bc2800 hp bc2800 hp bc2800 hp bc2800 hp bc2800 hp bc2800 hp bc2800 hp bc2800 hp bc2800 hp bc2800 hp bc2800 hp bc2800 hp bc2800 hp bc2800 hp bc2800 hp bc2800 hp bc2800 hp bc2800 Thus, the new environment will be implemented as follows: Provisioning Services 5.1 SP1 Web Interface 5.2 HP BladeSystem PC Blade Enclosure Branch Repeater XenDesktop 4 DDCs hosting - Presentation Server Console Laptop with Citrix Receiver Citrix License Server 11.6.1 Build 9020 SQL Server 2005 hosting Citrix databases: - XenApp Data Store - Configuration Logging - Provisioning Services - XenDesktop Data Store Dedicated Zone Data Collectors hosting - MMC comprising XenApp/XenDesktop Delivery Service Console - Advanced Configuration Console XenApp 5 for Windows Server 2003 Farm Page 24

Citrix Worldwide Worldwide headquarters Citrix Systems, Inc. 851 West Cypress Creek Road Fort Lauderdale, FL 33309 USA T +1 800 393 1888 T +1 954 267 3000 Regional headquarters Americas Citrix Silicon Valley 4988 Great America Parkway Santa Clara, CA 95054 USA T +1 408 790 8000 Europe Citrix Systems International GmbH Rheinweg 9 8200 Schaffhausen Switzerland T +41 52 635 7700 Asia Pacific Citrix Systems Hong Kong Ltd. Suite 3201, 32nd Floor One International Finance Centre 1 Harbour View Street Central Hong Kong T +852 2100 5000 Citrix Online division 5385 Hollister Avenue Santa Barbara, CA 93111 USA T +1 805 690 6400 www.citrix.com About Citrix Citrix Systems, Inc. (Nasdaq:CTXS) is the global leader and the most trusted name in application delivery infrastructure. More than 200,000 organizations worldwide rely on Citrix to deliver any application to users anywhere with the best performance, highest security and lowest cost. Citrix customers include 100% of the Fortune 100 companies and 98% of the Fortune Global 500, as well as hundreds of thousands of small businesses and prosumers. Citrix has approximately 6,200 channel and alliance partners in more than 100 countries. Annual revenue in 2006 was $1.1 billion. 2009 Citrix Systems, Inc. All rights reserved. Citrix, Citrix XenApp, Citrix XenServer are trademarks of Citrix Systems, Inc. and/or one or more of its subsidiaries, and may be registered in the United States Patent and Trademark Office and in other countries. Microsoft and Windows are registered trademarks of Microsoft Corporation in the United States and/or other countries. UNIX is a registered trademark of The Open Group in the United States and other countries. All other trademarks and registered trademarks are property of their respective owners.