The Palm Treo Pro is Palm's latest entry into the increasingly populated smartphone market. It runs Windows Mobile Professional Edition, and contains a radio that will allow it to work with just about every cellular carrier's networks. Unlike previous PalmTreo devices, the Pro is sold unlocked. In addition to a web browser, mobile versions of Office applications, Outlook and chat-style messaging, theTreo Pro serves as a music/video player (using Windows Media Player Mobile). Early tech commentators have criticized the small screen resolution (320x320 pixels) as compared to other similar devices.