Lot's of space Great spam filter that catches 100,04% of spam ( 0.04% non-spam) Easy and fast search options Integration with calander, docs View and save PDF, DOC, XLS, from within browser Great interface Good apps for Iphone, Android, Ipad Some nice integration options with Chrome browser Sign in at lost of places with your gmail account (stack overflow much?) I don't have to spell out the provider g.m.a.i.l. when I say my address to somebody.