Re: message from Microsoft: authentic?
If your copy of windows is legit then you have nothing to worry about and should install it. Certain software and updates will look for this before they will install (new versions of Windows Media Player, for example). If your copy of windows is not legit then you will get a bunch of annoying messages and an icon in your sys tray if you install it.
But I'm trying, Ringo. I'm trying real hard... to be the Shepherd.