[greggyb]

Microsoft is a big player in terms of resources, though not market share (2%?) in smart phones.

Based on their Windows 10 announcement yesterday, they are pushing universal device integration, which should help them in the enterprise market. If they deliver, what they'll have is a full stack of productivity, line-of-business, and analytics platforms through a unified UI for any device. Most enterprises already run Windows and if mobile/tablet integration is seamless with a Microsoft platform, that should be a large gain in market share.

The two big questions are if they can deliver well on the promise, and if they can leverage enterprise adoption to increase their consumer market share.