Microsoft Application Virtualization (App-V) 4.5 Service Pack 1 is released, and provides latest updates with following improvements:

• Support for Windows 7 and Windows Server 2008 R2 – includes support for Windows 7 taskbar, for AppLocker, for BranchCache, and for BitLockerToGo. R2 is supported for only Application Virtualization Server
• Support for third-party Kerberos realms provides support for environments that have a trust relationship and mapped user accounts between a Windows Domain and an MIT Kerberos realm. More info on TechNet
• Improved support for application publishing and streaming over HTTP and HTTPS protocols for following operating system editions: Windows XP Home Edition, Windows Vista Home Basic, Windows Vista Home Premium, Windows 7 Home Basic, Windows 7 Home Premium
• 973873 Hotfix Package 5 for Microsoft Application Virtualization 4.5 Cumulative Update 1: August 2009

Full Article: KB976338