Actually, Microsoft did directly enter the phone business, but not successfully
One of those actions, ironically, could be to strengthen the prospects for the Windows Phone mobile operating system.
If you’re a handset maker looking for a mobile OS, you’re not going to get it from Apple. Now, you may feel less comfortable banking on Google. Sure, you’ve got a few other options like potentially webOS from HP. But Microsoft will be the lone big player not actually making handsets. As AllThingsD quotes Gartner analyst Michael Gartenberg:“There’s no doubt they are going to have to give Windows Phone more serious consideration than they ever would before,” Gartner analyst Michael Gartenberg told AllThingsD. “On the other hand, they are still smarting from the Nokia deal. But at least Microsoft hasn’t taken that final step of going into the hardware business themselves.