Update Rollup 1 for Exchange Server 2007 resolves issues that were found in Exchange Server 2007 since the software was released. This update rollup is highly recommended for all Exchange Server 2007 customers.

For a list of changes included in this update rollup see KB930809.

Exchange Server 2007 must be installed prior to installing this update rollup.
Any Interim Updates for Exchange Server 2007 must be uninstalled prior to installing this update rollup.

32-bit editions of Windows Server 2003 SP1, Windows Server 2003 SP2, Windows Server 2003 R2, or Windows XP SP2 are only supported for Exchange Server 2007 management tools.

Update rollup 1 for Exchange Server 2007 (KB 930809)