Alright, I do know that many people are having this problem with Yahoo! mail... at least the free Yahoo! mail... that it will only work over 3G and not wifi. Well, I am having that problem as well as one with my hotmail account. Hotmail seems to retrieve the email over wifi, but when I click within a message to "See remaining (x)k I will get the notification that "This message is no longer available on server". Also, even though I have it checked in settings, deleting a message on my phone will not delete it on the server. I was wondering if anyone has a solution to these problems. In this case, simply switching to gmail is not the solution I am looking for.