I have gone through the steps to migrate from Mobile Me to iCloud on my Mac. The incoming mail server (p99-imap.mail.me.com) is grayed out and cannot be changed. According to Apple Support, that is not the correct incoming mail server. Thoughts?
In mail - preferences - advanced - uncheck 'enable this account'. click another account or tab to get dialogue box to save changes. check 'enable this account' click another account or tab to get dialogue box to save changes. get mail.