Microsoft has released update rollup 3 for Exchange 2010 SP2 deployments.
As usual, you need to be running atleast Exchange 2010 SP2 to apply this rollup successfully. Any interim updates from PSS should be deleted first. The required services are automatically restarted when the rollup is applied.
Download the update rollup here.
Check KB2685289 to know about the fixes included in the rollup.