Okay... When using the p01 prefix Outlook gives an error something like"could not connect to server. Make sure you are connected to the internet". Using my user name (with @me.com added), I get an error from Outlook that says, An unknown error has occurred in Outlook" when using Imap.mail.me.com and SMTP,mail.me.com.
I have always used my Dot Mac (not Dot Me) as a user name from the beginning, and also for iTunes. That IS my Aplel ID.
I am already using Open DNS as my server.
I seem to receive email sent through my Dot ME or Dot Mac email addresses which I use as default addresses, and have the forwarded to my actual ISP email adddress. My problem occurs when I attempt to use the iCloud address when sending emails from my Mac. I have always been able to accomplish this with MobileMe.
Thank everyone for your help so far.
Glenn