[PauloManrique]

"The nonsensical "one OS for all devices" strategy."

Which will probably make their mobile devices rise from nothing to something relevant

"IE6"

IS6 was a amazing browser at the time, the most advanced for years. The main problem was it didn't have a auto updater.

"Win 8, and the disastrous effect it had on the PC hardware industry. (Never mind the fact that MS took a perfectly usable and popular OS - Win 7 - and broke it almost beyond all imagination.)"

That's just your opinion.