On March 15 Sprint will be unveiling the new Treo Pro device. Palm’s Treo Pro smartphone will be available on the Sprint Mobile Broadband Network, which offers EV-DO Rev. At 3G speeds. However, the Pro has been available unlocked, and so available to various markets and operators, since August 2008.

On Wednesday, Sprint finally confirmed the rumors and announced that it will add the Palm Treo Pro to its smartphone lineup The Windows Mobile 6.1 device will be available online and in retail stores on that date and will go for $199.99. That is, of course, after rebates and after you sign up for a two-year contract and add an Everything Plan with data or $30 per month or higher data plan. You will also be able to purchase the smartphone through Palm on March 16.

The Treo Pro is the first Palm product with Microsoft’s Internet Explorer Mobile 6.1, which offers the option of an optimized mobile- or desktop-like Internet browsing experience. It also features a one-touch button for quickly connecting to Wi-Fi, a QWERTY keyboard and integrated GPS from Sprint Navigation.

The Treo Pro supports Microsoft Direct Push Technology for instant email, contacts and calendar information. It’s also compatible with the Microsoft System Center Mobile Device Manager 2008, which boosts security and offers easier device management and access to corporate networks.

“The combination of Sprint Mobile Broadband with EV-DO (Evolution - Data Optimized) Revision (Rev.) A technology and Windows Mobile 6.1 on a Palm smartphone creates a mobile solution that meets the needs of today’s mobile professionals,” said Kevin Packingham, senior vice president of product and technology development for Sprint. “For years, Sprint, Microsoft and Palm have worked together to provide businesses large and small with an affordable mobile experience that is second to none, and Treo Pro continues that collaborative tradition.”