"Later in 2010 Microsoft will make a public beta available of a tool that allows Windows Phone 7 to sync select content with Mac computers," a Microsoft spokesperson told Ars.
On the Windows side, sync is handled with the Zune software, which plays a role similar to iTunes in that it enables syncing music, video, photos, and other content to Microsoft's Zune devices and the upcoming Windows Phone 7 handsets launching in the next few weeks.
Microsoft has not previously released any media sync software for Mac OS X, forcing Mac users who purchased Zunes to run the software under emulation or under Boot Camp. And that may still be the case; Microsoft has not given any indication that new sync tool for Mac OS X will work with Zunes—the only information that we have at this time suggests that it works with Windows Phone 7 devices.
Source: ars technica