An update for Exchange 2007 SP3 has just released and can be downloaded at: Exchange 2007 SP3 Update Rollup 8 Download
This brings the build number to: 8.3.279.3
- For a description of all the included fixes, see KB 2734323
If you have a clustered environment, please see this article: Applying Exchange 2007 Update Rollups to Clustered Mailbox Servers
Remember to disable or remove all third party software during the upgrade (like antivirus, backup agents, disclaimers, etc.)
More information can be found on the Exchange Team Blog site.