For me, nothing; the huge thing about Gmail is it works flawlessly from my Android phone. No IMAP solution came close. These days I read most of my mail on the

For me, nothing; the huge thing about Gmail is it works flawlessly from my Android phone. No IMAP solution came close. These days I read most of my mail on the phone. Once I was in a long check-in line at the airport. Silly me, I figured I wouldn't check in at home because I had to check bags. At the airport I got on my phone, pulled up the confirmation email, checked in, and went to the bag drop line. With the clumsiness of IMAP and dealing with it on phones I would never have managed to do this if I was hosting my own mail, and even if I had managed to do it, the cost would have been the hours and the hassle of maintaining mail. It was at that moment that I realized I would never host my own mail again. Just not worth it.