Yesterday the Exchange CXP team released Update Rollup 1 for Exchange Server 2010 SP2to the Download Center.
This update contains a number of customer-reported and internally found issues since the release of RU1. See KB 2645995: Description of Update Rollup 1 for Exchange Server 2010 Service Pack 2′ for more details.
Find the update here, directly :
Download: Update Rollup 1 for Exchange Server 2010 Service Pack 2 (KB2645995) – Microsoft Download Center – Download Details