Yesterday Microsoft announced on their Exchange Team blog (URL: http://bit.ly/ynvrHT) that Update Rollup 1 has been released for Exchange 2010 SP2.

Read about what the update roll will fix:
http://support.microsoft.com/kb/2645995

Download link
http://www.microsoft.com/download/en/details.aspx?id=28809

Make sure you deploy this update into a test environment before deploying it into production!
If you’re looking for feedback, check in the comments field or go to the team blog link above and read the comments.
Leave feedback around the update in the comments field, thanks

Cheers