Windows Phone 7 meets fragmentation
windowsteamblog.com
windowsteamblog.com
It has nothing to do with fragmentation and everything to do with preparing for the next major Windows Phone upgrade.
So where's this fragmentation you speak of?
[1] http://www.neowin.net/news/wp7-multiple-calendars-marketplac...
It's been presumed, at least amongst those in the WP7 world, that all 7.0 devices would see the 7.1 upgrade, and I believe Microsoft even indicated such, but I can't find the proper link to cite.
I imagine iPhone/Android/WP phone owners will all experience similar OS upgrade lifespans.
Anyway, my issue with your submission is that you chose to editorialize something falsely.
Where do you see this fragmentation you're referring to? How does this perceived fragmentation differ from iOS and Android updates to old devices?