Among the most visible changes is the ability to type in a few letters of a song, contact or e-mail subject and have the phone automatically show only matching results. The software also supports HTML e-mail. But for Exchange messages to be viewable in that form, a company also has to have Exchange 2007, the new version of Microsoft's e-mail server software.
Windows Mobile 6 also builds in support for Windows Live instant messaging and e-mail, which enables users to see whether a contact is online and to get their Hotmail or Windows Live Mail messages pushed down automatically.
After years of struggling to make inroads in the phone business, Microsoft is starting to find its way. Its software is now on many of Palm's Treo devices and also on new, slim phones like Samsung's BlackJack and T-Mobile's Dash. The company sold 3 million licenses of Windows Mobile last quarter, up 90 percent from a year earlier.
The first phones with Windows Mobile 6 are expected this spring.