Microsoft Application Virtualization 4.5 Service Pack 1 (App-V 4.5 SP1) is now available. This service pack provides the latest updates to Microsoft Application Virtualization 4.5. Additionally, it contains the following improvements:

Support for Windows 7 and Windows Server 2008 R2
App-V 4.5 SP1 provides support for Windows 7 and Windows Server 2008 R2. This includes support for Windows 7 taskbar, for AppLocker, for BranchCache, and for BitLockerToGo. Windows Server 2008 R2 is supported for only the Application Virtualization Server.

Support for third-party Kerberos realms
App-V 4.5 SP1 provides support for environments that have a trust relationship and mapped user accounts between a Windows Domain and an MIT Kerberos realm. For more information about how to enable this support, visit the following Microsoft TechNet Web site:

http://go.microsoft.com/fwlink/?LinkId=166004

Improved support for application publishing and streaming over the HTTP and HTTPS protocols

App-V 4.5 SP1 provides support for application publishing and streaming over the HTTP and HTTPS protocols for the following operating system editions:

*    Windows XP Home Edition
*     Windows Vista Home Basic
*     Windows Vista Home Premium
*     Windows 7 Home Basic
*     Windows 7 Home Premium

Customer feedback and hotfix rollup

App-V 4.5 SP1 also includes a rollup of fixes to address issues that have been found since the App-V 4.5 Cumulative Update 1 release. This rollup addresses known issues and feedback from partners and customers who are using App-V 4.5.

In addition to some stability improvements, this service pack addresses the following issues:

*    When a virtual application tries to delete a file on drive C, a “file not found” error occurs even though the file is deleted successfully.
*     When you create an MSI package by using the App-V Sequencer, third-party tools may be unable to validate the resulting MSI package.

This service pack also includes a hotfix that was previously released. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

973873 Hotfix Package 5 for Microsoft Application Virtualization 4.5 Cumulative Update 1: August 2009