I am unable to authorize my itunes account on my new MacBook.
It keeps showing 'unknown error -42408'. I have two Apple IDs and it shows the same error message for both.
It could well be related to the fact I removed itunes 11 from the new laptop and reinstalled itunes 10 because it is significantly better (but it wont be if I can't play any of the music I purchased on itunes!!).
MacBook Pro, OS X Mountain Lion (10.8.4), itunes 10.7(21)