iCloud says my email is already taken because I had a .mac account
Hi,
Long, long years ago I had a .mac account. I kept it for a while but then I just didn't pay it and I assume it got canceled. I didn't need it ever only that yesterday I bought a Macbook Air with Mountain Lion. Now when I want to set up the email and the notes on the iCloud, it won't let me create the address I want to because, I presume, it's remembering the .mac address that I stop using almost 8 years ago.
What can I do?
Please help, thank you so much!
MacBook Air, OS X Mountain Lion (10.8.2)