Microsoft has paved the way for a new generation of mobile devices with the launch of the Ultra-Mobile PC (UMPC) platform. Supported by Intel and several hardware vendors, the new format promises devices smaller than laptops but more capable than PDAs.

The software giant officially unveiled the technology late last week at the Cebit IT trade show in Hanover, although Intel had already demonstrated several concept designs. The first models could be available as early as the end of March, from makers such as Samsung, Asus and Founder.

Previously codenamed Origami, the UMPC platform combines Microsoft’s Windows XP Tablet PC Edition with mobile chips from Intel or VIA. The devices weigh less than 1kg, typically have a 7in screen and offer wireless access to data and the web. Some models will also have a keyboard.

Bill Mitchell, vice-president of Microsoft’s Windows Mobile Platforms Division, said UMPCs are a new category of device designed to support the increasingly mobile lifestyle of users. “A UMPC is smaller, lighter and far more portable than other fully-functional PCs,” he added.

However, some industry watchers said it was difficult to see the value for business buyers unless UMPC models cost less than standard laptops. Microsoft said early models should cost $600 to $1,000 (£350 to £575).

“UMPC is very similar to Tablet PC – already just a niche product – with the distinction that it is slightly more portable,” said Brian Gammage of analyst firm Gartner. “What’s missing is some key application or capability to make it more appealing.” Battery life and performance are also likely concerns with such small devices.

At Cebit, Samsung showed off one of the first UMPC models, the Q1. This weighs 779g and runs ultra-low voltage Pentium M processors up to 1.2GHz with up to 512MB memory. The Q1 will cost €1,000 and is due to ship in May, according to reports.

Microsoft said future UMPC models will run Windows Vista, the next version of its client operating system.