Build 613 was recently released.
Among other changes, the expiration date is now 31 December 2005.
Further questions should be addressed to the Microsoft AntiSpyware
newsgroups:
http://communities.microsoft.com/newsgroups/default.asp?ICP=spyware&sLCID=us
If you are not currently running MSAS and are not familiar with Beta
products in general, it may be best for you to wait for the final build and
not use the Beta.
--
Jupiter Jones [MVP]
http://www3.telus.net/dandemar
http://www.dts-l.org