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If you see an MP3 player with "plays for sure" certification, the designation means the MP3 player is compatible with Microsoft's MSN digital music downloads. One of the ongoing mysteries about purchasing MP3 players is how to make sure the player will play music downloaded from digital services like iTunes or Connect. Apple players only play iTunes. If you want to use iTunes, you need to use an Apple player. But many MP3 players now play WMA files, compitable with the MSN service. However, these players will not be compatible with iTunes.
Bottom line: You need to make sure your MP3 player is going to play all your MP3s.