An Apple ID is in most cases an Email (Or was when your set it up)
That email could be one that you no longer use or have access to - such as changing ISPs
Use this Link to My Profile Support then Login and then change the Email Only.
I have done this to have my Account here send the emails to a different Email as the Dial-Up account eamil that this account is based on is something I want to drop.
There is also the Apple ID Support Login (Chose Manage account) which also allows you to change some items
Apple IDs linked to iCloud and older @mac.om or a MobileMe issued @me.com cannot have the Apple ID bit changed.
I would guess that either in the Apple Support ID spot you have an newer email listed as well as the ID email or that in the first link you have changed the email to something new (new = later than the ID was set up)
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
iMac 2.5Ghz 5i 2011 (Lion 10.7.4)
G4/1GhzDual MDD (Leopard 10.5.8)
MacBookPro 2Gb (Snow Leopard 10.6.8)
Mac OS X (10.7.4),
"Limit the Logs to the Bits above Binary Images." No, Seriously