ActiveWin.com references a WMTALK listserv email from a Microsoft employee indicated that support for WMA 9 Voice as well as all 9 Series codecs is coming to Mac OS X in the fall.
- "We are definitely planning to support WMA 9 Voice in the upcoming release of Windows Media Player 9 Series for Mac OS X. We showed the new player running with Apple's Safari browser at their WWDC a few weeks back. We're shooting for fall release to web right now and we'll keep the list posted. Thanks for your patience"