Why can't my iphone sync to my computer?

The other day, I cracked my iphone and it wasn't working, so I ordered a new one.
The problem is, I now have a different computer and my old Iphone won't sync to it so I can back it up for the new one. Why can't I sync my old iphone to my new computer? What do I do?

There's a good info here on how to sync your iPhone to a new computer
http://www.wideanglesoftware.com/touchcopy/features/

Hope it helps.

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