 The handset does rely on V CAST Music Manager software to transfer music to the phone, and that program only supports Windows XP, Windows Vista and Windows Media Player 10, but not Mac OS X or any other operating systems.The phone is alternately accessible with BitPim, an open source and multi-platform application to access CDMA phones of various cellphone manufacturers.The device's audio player supports MP3, Windows Media Audio (WMA and WMA Pro), and Advanced Audio Coding (AAC and AAC+) file types by default, instead of converting all formats to the WMA format, like most other V CAST phones require.