OffTopic - MS advertizes beta software in mass medias !

Today, La Libre Belgique's home page features an animated ad for MS AntiSpyware Beta. FYI, La Libre is a major belgian newspaper.

MS is running an ad campaign for some utility that is still in beta! I mean that the ad outlines that it's beta software.

OK, I agree this is a good piece of software. I run it myself and install it on all infected computers that I'm asked to fix. But this is not the point.

Why didn't they wait until it's officially released to start their massive ad campaign. Or if it's ready for prime time, why don't they officially release it first ? Anyone with a clue, please tell me !