This field notice came out a few days back:
http://www.cisco.com/en/US/partner/products/products_security_advisory09186a0080436587.shtml
Since Unity is installed on a non-Cisco-customized version of Windows, we have to check with Microsoft for a fix to Windows on that box.
My concern is if installing that patch would break anything on Unity. If Cisco folks can confirm that we can go ahead with installing the patches from Microsoft on Unity, we can proceed.