Version: Service Pack HotFix Date Server Seq Client Notes
4.5.3.20031  SP2 HF 2
KB2507096
   

 March 2011

Link to KB2507096

Appears to fix an issue that occurs when the App-V server tries to publish more than 2000 packages, or more than 500 OSDs (in a single package, I think).  Fix must be applied to both server and clients.