The Exchange team is announcing today the availability of 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. More information on this rollup is available in KB2936861.
Note: The KB article may not be fully available at the time this post was published.