WTS,
I went over the information that is presently available on the MS Anti-spyware program. Actually, I like the clean, simple, user freindly interface. It has the most needed functions and an easy to understand information panel.
Not clear on whether it is free, or how often updates will be available for manual or auto download.
As for Messenger Plus....
MS did not say MP itself was spyware. It warned that it bundles with other programs that ARE spyware. In any case, it pays to be cautions.
My recommendation: Stay with Spyware Blaster and SpywareGuard.
If you want a really nice anti-spyware (resident), try Spyblocker. I still have version 4.75 which was the last freeware. It protects against cookies, spyware, scripts, ads, bugs and worms.