My bad! Don't trust everything you read on the Internet. :) The Yahoo-iPhone push system uses something entirely different. At this time, the mail app in the iPhone doesn't support IDLE, so looks...

I'm not sure whether Zimbra supports P-IMAP or not, but the iPhone does as that is what it uses for accounts on Yahoo. iPhone 2.0 (1.2) will have Exchange active-sync support, so you should be able...