Microsoft have released Update Rollup 9 for Exchange 2007 SP1. This rollup includes included many bug fixes, but also enables support for Windows Server 2008 R2 Domain Controllers in the environment. For a full list of the issues that the update rollup fixes, click here

Update Rollup 9 for Exchange Server 2007 SP1 is a cumulative update. This update replaces rollups 1 – 8.

To download and for more information, click here