Today 02/12/2013 Microsoft released Rollup 6 for Exchange Server 2010 SP2
After you install this Rollup 6 you will update Exchange Server 2010 SP2 version number to 14.2.342.3
This update resolves issues that were found in Exchange Server 2010 Service Pack 2 since the software was released.
This is a cumulative rollup as always so you don’t need to install previous versions.
This update rollup is highly recommended for all Exchange Server 2010 Service Pack 2 customers.
Rollup 6 for Exchange Server 2010 SP2 is available here:
Update Rollup 6 for Exchange Server 2010 Service Pack 2 (KB2746164)
List of all build numbers of Microsoft Exchange Server you can find here:
Microsoft Exchange build and version numbers
As always we recommend do not install new Rollups in production environment, you should test it first in LAB.
For a list of changes that are included in this update rollup, see:
Description of Update Rollup 6 for Exchange Server 2010 Service Pack 2 (KB2746164)