Hello,
We have also released the Update Rollup 10 for Exchange Server 2007 Service Pack 3. You can see the related information here :
Microsoft Security Bulletin MS13-012 - Critical : Vulnerabilities in Microsoft Exchange Server Could Allow Remote Code Execution (2809279)
http://technet.microsoft.com/en-us/security/Bulletin/MS13-012
The download link is :
Download Update Rollup 10 for Exchange Server 2007 Service Pack 3 (KB2788321) from Official Microsoft Download Center
http://www.microsoft.com/en-us/download/details.aspx?id=36708
Kindest regards,
João Ribeiro