if you put video, music and pictures in the zune is it possible to get them back on a computer?

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Yes you can take content back from your Zune normally.
Even on other PCs you can move content back and forth. But this content can't be from Zune Marketplace (DRM-protected only, not the normal mp3-tracks).

Zune v1 allowed Marketplace content to be moved back only on your "home" Zune Software installation. I'm not sure what's the case with v2.

But non-Marketplace content can be moved with no problem.

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