Microsoft has released Update Rollup 14 for Exchange Server 2007 Service Pack 3.
This latest rollup supports recent DST updates. The rollup contains all previously released security bulletins and fixes and updates for Exchange Server 2007 Service Pack 3 as well. This is not a security release, but customers are encouraged to deploy these updates to their environment once proper validation has been completed.
A complete list of included updates is available here.
Update Rollup 14 can be downloaded here.