My only regret is having done some documents and presentations in proprietary Apple formats that are hard to liberate. Much worse than Microsoft lock-in.
If you are talking about Pages or Keynote, go to File -> Export. From there you can choose about 5 different formats, including PDF, and MS formats
Correct me if I am wrong, but the Apple "gadgets" don't use OSX, but iOS.
Almost everything Apple uses OS wise is OS X (only things that don't are iPod Classic, Shuffle, and Nano). iOS is built from OS X, and Mac OS X is built from OS X. OS X is to Apple what the NT kernel is to Microsoft, nothing uses it on it's own, but basically all Microsoft devices are using the same NT core, just with different features and frameworks built on top of it. (That said I can't actually remember if WP7 née WinMo née Win CE uses NT)
and passengers in some stations are being asked to take the stairs instead of the escalator.
Escalators are stairs (even ones that are off)...
Remember -- only 10% of anything can be in the top 10%.