iTunes作為Apple產品的必要軟件，相信無論喜歡不喜歡，有不少朋友都有在用。不過，其實它在Mac上來說，並不是一個很貼近潮流的軟件，一直也是用老式的Carbon API來編寫，不過最新的iTunes 10.5則轉成新的Cocoa API，並支援64bit運算。
在最新的iTunes 10.5 developer beta中，Lion版本是以64bit運作，但在較舊版本的OSX中則是32bit。由Carbon轉到Cocoa確是一個大工程，所以很多舊軟件，即使推出新版本，也不會重新用Cocoa編寫一次。不過現在只有Cocoa支援64bit運作，要運用更多的RAM，就只好以Cocoa重新編寫一次了。（例如Adobe就把Photoshop CS5重新用Cocoa編寫以支援64bit模式）
來源：MacRumors
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