Hi guys! I might be asking about something already covered, but my searching did not return clear info.. :-( I went to buy an iPad2 today, but when I found out that I can't edit xls files unless trasferred via iTunes, can't even download them from my email, can't actually download anything over air I decided it's not worth it. BUT now I read about JBing, and it seems there is a way to make this otherwise great gadget a bit more user-friendly & usable. My question is would the warranty of the iPad2 be lost once eventually JBed? Thank you!