With the release of vB4 Forums and Publishing Suite please note the following information regarding support for older versions of vB:
3.8.x: Supported and updated for bugs and security fixes.
3.7.x: No longer supported and will only be updated for security fixes.
3.6.x and earlier: These versions are end–of-life and are no longer supported or updated.
vBulletin 3.6 and 3.7 are now End-of-Life
3.8.x: Supported and updated for bugs and security fixes.
3.7.x: No longer supported and will only be updated for security fixes.
3.6.x and earlier: These versions are end–of-life and are no longer supported or updated.
vBulletin 3.6 and 3.7 are now End-of-Life