I believe the trademark is registered regardless of capitalisation, otherwise we'd have ridiculous situations like GoOgLe being non-infringing. So 'iTunes Match' is protected whether it's spelled 'ITUNES MATCH', 'iTUNES match' or whatever other combination you want.
That is however a separate issue to a company's preferred usage of its mark, where it has the prerogative to specify a preferred capitalisation. Again, the examples of 'Blackberry' and 'MicroSoft' being incorrect are relevant here.
As an aside, I love that we got into a debate on this. In what other community would such needless minutiae take up anyone's time? :)
That is however a separate issue to a company's preferred usage of its mark, where it has the prerogative to specify a preferred capitalisation. Again, the examples of 'Blackberry' and 'MicroSoft' being incorrect are relevant here.
As an aside, I love that we got into a debate on this. In what other community would such needless minutiae take up anyone's time? :)