I'm 3.1 beta 3 and while I can't say I didn't have this issue on 3.0 I wasn't running it long enough. So I'm not sure if its mobileme or 3.1 Someone sends me an email and it pops up on mail.app on my desktop but the iphone has yet to register it. I open mail.app on the iphone and my inbox is empty all the email is gone. It then automatically re-downloads all the email including the latest one. Thereafter mail push works fine until it crashes again. If I have to keep opening mail app to see if it has crashed or not then I might as well set it to manual and get some more battery out of it. Any suggestions?