Hi celloitt147,
Whilst Messages Beta was around I got the impression that linking a MobileMe name (username@me.com) to an iCloud account (Also username@me.com) created a situation where you were then asked to Close the MobileMe account.
I think this then effectively closed the linked ID as a whole to some parts of the services that Apple offer.
As I said I got this Impression but no-one seemed to confirm that when setting up their iCloud @Me.com name they had managed to use the same @me.com name.
My Own experiences is of linking an external email to Apple (But Apple ID) to an iCloud issued @me.com.
This gives me two names (using the same password) to access my iTunes, App Store Apple Support Communities.
However for iMessages they are two different IDs when used in Messages and sending iMessages.
Also only one of them is a Valid AIM Screen Name in Messages.
Similar to the @Mac.com to @Me.com or linking them at the .Mac to MobileMe change over I think thre iCloud process allows the creation of two IDs of the same name. (I can't prove this though).
If this is then followed by the closing of the MobileMe part it seems that access is also denied.
I also have @mac.com account where I have removed the linked email address on the Apple ID site which may also be causing me some issues (See my reply to Michael Paine on the 30th)
7:46 PM Tuesday; July 31, 2012
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
iMac 2.5Ghz 5i 2011 (Lion 10.7.2)
G4/1GhzDual MDD (Leopard 10.5.8)
MacBookPro 2Gb (Snow Leopard 10.6.8)
Mac OS X (10.6.8),
"Limit the Logs to the Bits above Binary Images." No, Seriously