My friend has a Tour, and he has his AOL email account set up. It was working fine for a while, but now emails are going directly to his BB and not tot he AOL account on his computer. Mind you, these are active emails that have not been deleted on the BB.
Is there a setting that might cause this to occur, pulling to the phone and not leaving on the AOL server?
Try looking in the "old mail" on AOL. Once it is pushed to the phone and opened, it goes into the "old mail" tab. At least that's how it works for mine.