Edit: Update Rollup 16 is now available for Exchange 2010 SP3 see the post Exchange 2010 SP3 Update Rollup 16 installation tips.
The Exchange team today released Microsoft Exchange 2010 Service Pack 2 Rollup 5 v2.
The original Rollup 5 caused a number of issues when it was originally released on the 13th November (more info here).
Update Rollup 5 v2 for Exchange Server 2010 Service Pack 2 (KB2785908) can be downloaded here.
The Security Bulletin MS12-080 provides more information about the update, and the Knowledge base article KB2785908 provides a list of all issues fixed with this release. As it is a security update it will be available via Microsoft Update.
Update Rollup 8 for Exchange Server 2010 SP1, and Update Rollup 9 for Exchange 2007 SP3 have also been released today to address issues detailed in the Security Bulletin MS12-080.