Earlier today, the Exchange CXP team released Update Rollup 3 for Exchange Server 2010 SP2 to the Download Center.
This update contains a number of customers reported and internally found issues. See KB2685289 Description of Update Rollup 3 for Exchange Server 2010 Service Pack 2 for more details.
Note: Some of the following KB articles may not be available at the time of publishing this post.
In particular we would like to specifically call out the following fixes which are included in this release:
For DST Changes: http://www.microsoft.com/time.
Note for Forefront Protection for Exchange users For those of you running Forefront Protection for Exchange, be sure you perform these important steps from the command line in the Forefront directory before and after this rollup's installation process. Without these steps, Exchange services for Information Store and Transport will not start after you apply this update. Before installing the update, disable ForeFront by using this command: fscutility /disable. After installing the update, re-enable ForeFront by running fscutility /enable.