Well if you can't eliminate the competition, buy them.
Pretty much consistent with Microsofts past business practices, which of course resulted in numerous anti-trust proceedings against them, which they lost. Of course the Justice Department has done a piss poor job of enforcing the decision against Microsoft (thanks to the Bush Administration), hence no viable competition exist today for Desktop Operating Systems (Apple, Linux, BSD have insignificant market share). Imagine for a moment going to buy a new car, and no matter what dealer you went to, all the cars had the same engine (which was not known for being particulary reliable), would you be happy?
Yes, there actually are valid reasons Anti-Trust laws exist, and I can see a long line of Folks testifying before Congress why this deal is going to be a bad idea.
Scott W.