Windows Mobile 6 set to be unveiled

With its latest mobile operating system - Windows Mobile 6 - Microsoft is promising improved search, better security and tighter integration with Windows Live services.

Microsoft plans to officially announce the OS next week at the 3GSM trade show in Barcelona. The first devices using the software aren't expected until spring, however, with the bulk of products using it likely to come in the second half of the year.

Among the most visible changes is the ability to type in a few letters of a song, contact or email subject and have the phone automatically show only matching results. The software also supports HTML email. But for Exchange messages to be viewable in that form, a company also has to have Exchange 2007, the new version of Microsoft's email server software.

Windows Mobile 6, formerly code-named Crossbow, also builds in support for Windows Live instant messaging and email, 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 such as Samsung's BlackJack and T-Mobile's Dash. The company sold three million licences of Windows Mobile last quarter, up 90 per cent from a year earlier.

Because it uses the same core - Windows CE 5 - the new mobile operating system is expected to work with nearly all the existing Windows Mobile 5 apps.

John O'Rourke, a general manager in Microsoft's Mobile and Embedded devices unit, said: "We hope to be 100 per cent compatible. If an application works in Windows Mobile 5, it should work on Windows Mobile 6."

On the security front, the new Windows Mobile allows individuals and businesses to better protect their data. The OS can now protect not only data stored on the phone but also encrypt information stored on a removable memory card. Businesses can also set policies requiring passwords to be changed regularly and also demand that they be made more complicated than '111111' or '123456'.

As with past versions, the operating system comes in both touchscreen and non-touchscreen versions, with software makers still likely to need to write separate versions of their applications.

In addition, Microsoft has rebranded the two versions. Pocket PC Phone Edition, for touchscreens, becomes Windows Mobile Professional, while Smartphone edition, for non-touchscreens, becomes Windows Mobile Standard. A third version, Windows Mobile Classic, is designed for PDAs without phone capabilities, an increasingly small slice of the market.

Neither Windows Mobile Professional nor Standard initially supports Office 2007's new file formats. That support is due to come in the summer, with a test version due out in the spring.

One of the changes that is under the hood in Windows Mobile 6, but not expected to be visible to consumers, is support for VoIP calling. Microsoft isn't including software to let individuals make such calls but has added the internal plumbing to allow carriers and device makers to add support if they wish.

O'Rourke said: "It's an investment we are making for something that today isn't as predominant. I wouldn't be surprised if in the next 12 months we saw some partner announcements [around VoIP]."

Ina Fried writes for CNET News.com