Update Rollup 10 for Microsoft Exchange Server 2007 Service Pack 1
Update Rollup 10 for Exchange Server 2007 Service Pack 1 fixes the issues that are described in the following Microsoft Knowledge Base articles:
981832 (https://support.microsoft.com/kb/981832/ ) MS10-024: Vulnerabilities in Microsoft Exchange and Windows SMTP Service could allow denial of service.
This is a Critical Update and is already available via Windows Update.