||OS ROM version: 3.34.721.2 WWE , Radio ROM Version : 25.83.40.02H_1.70.19.09; This is a Windows Mobile® 6.1 Professional upgrade for the HTC TyTN II. Windows Mobile® 6.1 is the latest upgrade for Windows Mobile and it gives you improved usability, messaging and connections features. Windows Mobile® 6.1 comes with a host of new and enhanced features for: * Messaging: including threaded SMS, recipient auto-complete, Direct Push improvements… * Connectivity: Internet Explorer enhanced browsing, Wi-Fi and Bluetooth connection setup simplification, etc. * Device Enrollment in company domain: enables the System Center Mobile Device Manager to manage the device. * and more ... The PDF document supplied in this download describes in more detail all the new features in Windows Mobile® 6.1. In addition to improvements specific to Windows Mobile® 6.1, this update also includes a software update to address certain customer concerns, improving overall display performance and device responsiveness.