We have released security updates for the following versions of Exchange:
Security related changes for Exchange 2007 and Exchange 2010 ship as Update rollups following the cumulative servicing model. However we have tried to keep the number of non-security related changes in these rollups down to a minimum.
More information can be found in the security bulletin at Vulnerabilities in Microsoft Exchange and Windows SMTP Service Could Allow Denial of Service (981832)
- The Exchange Team