John Dvorak wrote an entertaining article detailing Microsoft's Plan to Take Over the World. Basically he says Microsoft will release Office for Linux and get Linux converts to start using it. A Microsoft version of Linux will then be released that will eventually become the only version supported by Office. Over time Linux users will be plagued by limitations in the Linux version of Office and constantly reminded of the great features available in Windows. Microsoft will wait until all the Linux converts are singing in unison with them about the problems with Linux and then abrutly kill all Microsoft Linux software. Somehow everyone will then assume that Linux is officially dead.

Likely? I don't think so.
An entertaining conspiracy theory? Definitely.