Umm, probably not. If you created a
*@me.com address, that is what you have. It's starting to sound like you really do have an iCloud account and not a MobileMe account, even though you're asking about MobileMe.
However, just in case you really do have a MobileMe account:
- iCloud and MobileMe are different services.
- iCloud uses *@me.com addresses, just like MobileMe, which can be confusing.
- If you originally signed up for iCloud, you signed up for iCloud and not MobileMe.
- If you originally signed up for MobileMe, you signed up for MobileMe, and not iCloud.
- iCloud is the successor to MobileMe.
- MobileMe is shutting down around the end of June 2012.
- If you originally signed up for MobileMe (and it's starting to sound like you did NOT, even though you're asking about MobileMe), you should transition to iCloud before MobileMe shuts down.
- iCloud is missing some MobileMe services. In particular, iCloud does not have iWeb, Gallery, or iDisk. If you convert from MobileMe to iCloud, you need to save/backup your data (iWeb, Gallery, iDisk, etc., etc.) before the conversion.
- For more transition questions, see Apple's FAQ: https://support.apple.com/kb/HT4597
However, if you already have an iCloud account, I don't know what's causing your problem. Logging into aim using the iCloud account works for me and others, and so I'm at a loss.
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My iCloud account was migrated from MobileMe, and my iCloud account works in AIM for iPad (I don't have any AIM friends attached to that iCloud account, and so I can't actually send any messages, but I can login

).