Mundu IM: Mobile Instant Messenger (Windows Smartphones) 4

Mundu IM all your buddies on MSN, Yahoo, ICQ, AOL, Google Talk and Jabber on your Windows Smartphone from one single user interface. There is no cost per message. Mobile data plan required. You can carry out a host of real-time, important activities such as photo sharing and file transfers, cross-conferencing and dynamic group management. You can also do cool stuff like share photos through the application; express yourself better with Rich Text and status-customization.

Version 4 added interoperability with Gtalk & Jabber.