heated battle with Microsoft to prove that it deserves the sole rights over its "App Store" trademark claim, has filed suit against Amazon for "improper use" of the same. Amazon's Android Appstore seems to have been intentionally contracted to a single word to differentiate its name, but that difference isn't enough for Apple, which has asked a California court to grant a ruling preventing Amazon's use of the moniker and asking for unspecified damages. Apple claims it reached out to Amazon on three separate occasions asking it to rename its software download offering, but when faced with the lack of a "substantive response," it decided to take things to court. Its big task remains unchanged -- proving that the term App Store is something more than a generic descriptor -- and this was a somewhat inevitable move given Amazon's choice of name. The legal maneuvering, as always, continues.