I've got a user with an I phone, We set up her corporate email account on the phone using IMAP. It seems to work fine except at night about 7 or so (she says) she cannot send or receive company email from the phone. She can still send and recipe emails through her gmail account on the phone.I don't know when during the night it starts working again but in the morning it works for her. I've got other users using droids and blackberries and they don;t have any problems. I can;t finsd the cause for this. I don't see how the backups could cause this and they don't start till 11PM. Are there any IPHONE reasons I don't know about?