Saw this closed thread: http://forums.hexus.net/showthread.php?t=50830 concerning an expired version of MS_AS.
For many(myself included), the old version expired in July. However, users were advised via updater, that a new, longer lasting version was available, and would not expire until December 2005. Obtaining it, was simply a matter of updating, or downloading the later version.
For the new version of MS_AS, please visit the MS_AS site. There, you can obtain the new version and read about developments.
http://www.microsoft.com/athome/secu...e/default.mspx
It should be noted that MS_AS, is free of charge. However, it does not take what many might deem as appropriate action concerning certain types of malware. To deal with those particular apps, you would be best advised to use other anti-spyware products.