Update Rollups have been made available for Exchange 2007 and Exchange 2010.
- Update Rollup 2 for Exchange Server 2010 Service Pack 1
- Update Rollup 2 for Exchange Server 2007 Service Pack 3
- Update Rollup 5 for Exchange Server 2010 RTM
- Update Rollup 5 for Exchange Server 2007 Service Pack 2
Note that these will be the last Update Rollups for Exchange 2007 SP2 and Exchange 2010 RTM. It is recommended to upgrade to Exchange 2007 SP3 or Exchange 2010 SP1.