From Zune (iPod competitor), to Kin, to Origami (small touchscreen laptop), to Games for Windows Live (steam competitor), to Live.com (google competitor v1), Bing.com (google compeititor v2), Expo (craigslist competitor), whats-it-called? (twitter competitor for natural disasters), Expression, Silverlight (flash competitor), Windows Live Spaces (wordpress competitor), Windows Phone...
Microsoft loves to start things, then leaves them to rot.
The Micro-Cycle:
1) See someone make money. Get starry eyed.
2) Rush into industry with product.
3) Let product/service rot.
4) Sunset product/service.