There is no Mac version of Microsoft's Zune software. Microsoft has provided a different option, though :
I know nothing about it, but it's worth trying. If you need assistance or other options, the Microsoft/Zune forums will probably be your best route.
Mark/Space has a software tool called The Missing Sync that allows for syncing across various Desktop and Mobile OSes, and there's a version for Windows Mobile.
- The Missing Sync is a paid product, not freeware.
- I have used TMS to sync an older version of Windows Mobile (6.0, I think) to my Mac, and it worked pretty well.
- I do not work for Mark/Space, and do not recieve any credit or compensationfor this recommendation. It's merely my experience speaking.