MS released Update Rollup 6 for Exchange Server 2010 SP2 and Exchange 2007 SP3 RU10 to the download center and is available to download.
Download Link:- Update Rollup 6 for Exchange Server 2010 Service Pack 2 (KB2746164)
Download Link:- Update Rollup 10 for Exchange Server 2007 Service Pack 3 (KB2788321)
These update mainly includes fixes for the customer reported problems, read more on Exchange Team Blog.
-Praveen