I switched to iCloud a month ago and never had problems with my mail on my apple at home. However, last week, all of a sudden, out of the blue, on two of my mail accounts, I began to have problems. NOT accepting my passwords. So I had to delete them (frustrating) and log in to iCloud to access them. Coming across this community, I began reading all the issues. My mac is a 10.5.8.
I did follow all of Roger's instructions, except HOLDING down the control, or clicking on USE SECURE sockets layer. That option did not come up for me.
After going through the entire process, both accounts are back up and running on mail.
WHEW!
So, now I have two mail accounts with the @ icon and 2 with the MobileMe IMAP. Since MobileMe ends June 30, I will just go ahead and delete both remaining MobileMe IMAP accounts and follow the same instructions, since I anticipate I will also be having problems with those as well.
Carl, I understand how frustrated you are. Maybe going into an Apple Store and talking to a rep would help?That was going to be my next step, if this did not resolve it.