[Spambayes] release date stable version?

Hello, i know this is on the "Don't ask this!!!" list, but... The current version 1.1a4 works very well here (Vista 32 Ultimate, OL 2007). But everytime I tell some users "Try Spambayes! It works perfect!" I get the answer, "Should I really installl a 4 year old addin?" Peter