Microsoft has released Update Rollup 6 for Exchange Server 2007 Service Pack 3

Update Rollup 6 for Exchange Server 2007 Service Pack 3 (SP3) resolves issues that were found in Exchange Server 2007 SP3 since the software was released. This update rollup is highly recommended for all Exchange Server 2007 SP3 customers.

For a list of changes that are included in this update rollup, see KB2608656.

This update rollup does not apply to Exchange Server 2007 Release To Manufacturing (RTM), Exchange Server 2007 Service Pack 1 (SP1) or Exchange Server 2007 Service Pack 2 (SP2).

For a list of update rollups applicable to Exchange Server 2007 RTM , Exchange Server 2007 Service Pack 1 (SP1) or Exchange Server 2007 Service Pack 2 (SP2), refer to the Knowledge Base article KB937052.

  Update Rollup 6 for Exchange Server 2007 Service Pack 3 (KB2608656)