Microsoft has released Update Rollup 3 for Exchange Server 2007 (KB935999). This update comes about 7 weeks after the previous one. It has fixes for 6 issues, mostly minor ones, listed in KBA 935999.
The update is available for both 64-bit (x64) and 32-bit (x86) systems.
The cumulative nature of Exchange Server 2007 updates/rollups means Update Rollup 3 includes the updates in Update Rollups 1 & 2. [For more details on changes to the update/patch model for Exchange Server 2007, read the previous post, “Changes to hotfix/patching model for Exchange Server 2007“]