Microsoft has released the Update Rollup 2 for Exchange 2007 Service Pack 2. This update rollup does not apply to the Exchange Server 2007 RTM or SP1.
The required services are automatically stopped and then restarted when you apply this update rollup. If you want to remove this rollup update for some reason, remove update 972076 from add/remove programs in the control panel.
Download the update rollup 2 here