Exchange Team released Update Rollup 15 for Exchange Server 2007 SP3
Update Rollup 15 for Exchange Server 2007 SP3 resolves security issues that are described in December 2014 security update for Exchange Server 2007 and Exchange Server 2010.
Additionally, this update resolves the issues that are described in the following Microsoft Knowledge Base (KB) articles:
3004235 Exchange Server meetings in Russian time zones as well as names of time zones are incorrect after October 26, 2014
3008308 Public folder database migration issue in a mixed Exchange Server environment