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LOL! And MS doesn't do that. Last time I looked MS has been putting out Alphas, Betas and rewrites of Longhorn/Vista or whatever the name is now for like 4 years!
And we are supposed to take that serious. At least with Ubuntu they actually put out a working product on a regular! On top of that according to MS Vista will be their last major release or Windows and from now on they will do like Apple and Linux and do small release and feature updates!
Even the big boys know that this is the way to keep people interested in your products.