Mass Storage Synchronizer is an Windows-based iTunes Add-on for Sony Ericsson Walkman, Sony Clie, P900/P910 Smartphones as well as Palm OS Treo, Samsung and Nokia mobile devices. This combination of iTunes and Mass Storage Synchronizer allows Sony Ericsson mobile users to use iTunes to manage their songs, and sync/update the songs to the mobile phone.

The following audio files can be managed from iTunes to the Walkman Phone via Mass Storage Synchronizer:

MP3
MP4
M4A
3GP (Audio encoded in AAC or AMR)
AMR
WAV
G-MIDI