Never count on MS
Simples.
Windows Phone, Windows RT, zune, bob, you name it ... if they feel like "discontinuing" it, they will.
Don't trust Microsoft ... NEVER ! Hello, anybody in ?
Been bitten ? Wait, I am am trying hard to give a fsck ... I cannot ... YOUR OWN DAMN FAULT!
Do no trust Microsoft, never, they will shaft you like they have shafted:
IBM
Apple
Caldera
IBM
Sybase
Borland
Novell
SGI
Suse
Sun
.... you name it ...
Note: many more missing, the order might not be correct, only from the top of my head. No, I do not care, my main point is: NEVER, EVER, EVER, EVER, NO REALLY, TRUST MICROSOFT!