Last month's Windows 7 rollup updates and the security only updates, which included the SMB worm patch are now expired in SCCM 2007. That means we have to seriously accelerate the May cycle because we can't continue to patch from April or earlier. I think this is an unintended consequence of the new Windows 7 update cycle. I just don't recall that security updates were killed so quickly before these changes.
We are busily migrating to SCCM 2012 but now we know there is a very short window from release date to deployment for our remaining SCCM 2007 clients and we'll handle it better next month. OK, Microsoft, we'll work harder and finally shut SCCM 2007 down! -Russell