It has been long rumoured that Microsoft would introduce Zune software onto the Windows Mobile operating system.
In an interview with CIO magazine Steve Ballmer confirms that Microsoft is looking to port the software to Windows Mobile devices.
When questioned why Microsoft developed the zune, Ballmer replied:
"At the end of the day, one of the big trends is that all content is going digital. And if we don’t have the software and services that are useful, helpful and valuable for the consumption of music and video, we are sort of not really a player.
Now, we built the Zune hardware with the Zune software - and what you’ll see more and more over time is that the Zune software will also be ported to and be more important not just with the hardware but on the PC, on Windows Mobile devices, etc."
This is the strongest indication that Microsoft will be porting the software. We’re not sure when exactly but you can bet that Windows Mobile 7 will have it included.

Source- Neowin