After I jailbroke my iPhone, my Push Mail, Calendar, Contacts and Bookmarks stopped syncing. The reason was because all my mail settings were reset. So I simply switched them all to sync. Didn’t work. I tried all kinds of stuff to try and get my accounts to sync from me.com, but nothing worked. Rebooted, toggled the switches a few more times… nothing.
What finally did it was to delete the MobileMe account completely, power the device off, power it on, and then re-add the MobileMe account. Sure enough, my iPhone was once again in sync with me.com. =)
.: Adam