Hi..I am lucky, the Apple Store is right near me so I went to Genius Bar for help, we completey cleared out and reset my email accounts, AOL and .mac...basically started from scratch and let leopard set it up and then mail worked....However, then synching with my IPhone, I could not delete mail from my mail account...somehow some of the old server names were still there..so went in and deleted those.... and changed the setting save deleted mail on server to "no" and that solved it......
So my AOL in the Mail application is now working but I cannot attach in AOL..Called AOL and that seems to be a problem they are working on....