Fresh from their spat with RealNetworks, Apple has now taken to sparring with Microsoft over MSN Music, Redmond's new competitor to the iTunes Music Store. The best part is how Apple VP of applications Eddie Cue says that the biggest problem with the MSN Music store may be that "its downloaded songs can not play on the iPod." Totally fair criticism, except that the reason MSN Music downloads won't play on the iPod is because Apple has so far resisted Microsoft's entreaties to work together on compatibility. This is going to get ugly.

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