Microsoft has re-released Rollup 5 for Exchange 2010 SP2 to address a recent security issue.
Download: Update Rollup 5-v2 for Exchange Server 2010 Service Pack 2 (KB2785908)
View: Original list of fixes in Update Rollup 5 for Exchange 2010 SP2 (KB2785908)
View: Microsoft Security Bulletin MS12-080 – Critical
