On August 13th 2012, the Exchange CXP team released Update Rollup 8 for Exchange Server 2007 SP3 to the Download Center.
This update contains a number of customer reported and internally found issues. See KB 2734323 Description of Update Rollup 8 for Exchange Server 2007 Service Pack 3.
In particular we would like to specifically call out the following fixes which are included in this release:
Note: Some of the following KB articles may not be available at the time of publishing this post.
For DST Changes: http://www.microsoft.com/time
Update 6:54 PM: Updated link to KB 2740358: MS12-058: Vulnerability in Microsoft Exchange Server WebReady document viewing could allow remote code execution: August 14, 2012.