Fortunately, MS are not going to be asking me for all the swag branded with the soon to be deceased logo, I have several bags, mice, watch, etc, etc,etc - plus a huge array of shirts! At least I hope not!
But why does any company, in this case Microsoft that dropping old stuff, and replacing it with new stuff is necessarily the best way forward? From where I sit, the old logo was not broken - and I'd have rather the huge sum that was spent (brandeing is NEVER cheap) sent to feed the starving in Africa. There is one good thing though - based on this 'professional' logo, I now realise I DO have good graphic design skills. :-)