Citrix recently released updates for the Citrix XenDesktop 4.0 Virtual Desktop Agent designed to improve the end user virtual desktop experience. Service Pack 1 which includes Hotfixes 1, 2, and 3 for the Citrix XenDesktop 4 Virtual Desktop Agent was released in July 2010. As administrators prepare to upgrade their existing environment with the most recent Virtual Desktop Agent (VDA), there are different implementation considerations for different types of virtual desktop deployments. This paper addresses upgrading the VDA on virtual desktops in two distinct categories:

• Pooled Desktops, also known as hosted VM-based desktops, are defined as a group of virtual desktops that utilize a single virtual desktop image delivered by the Provisioning Services feature of XenDesktop. Guidance for updating the VDA in this environment is provided in the Pooled Desktops section.
• Assigned Desktops are defined as a group of virtual desktops that utilize a dedicated virtual machine for each desktop. Assigned desktops do not utilize Provisioning Services. Guidance for updating the VDA in this environment is provided in the Assigned Desktops section.

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