My wife was use to OE, then got use to Vista Win mail (replacement for OE). When she Upgraded to Win 7. She hates change!!. I ended u porting Vista win mail over to Win 7. Not simple, but doable. Problem is you need access to a vista Computer and Need to copy the win mail directory to a thumbdrive, then transplant it to win 7.
NOT as simple, Just google it. It involves changing files/folder permissions.