Microsoft recently unveiled an ‘ultra-mobile personal computer,’ or UMPC, in a move to fill a market niche between laptops and handheld computers. The first UMPCs small computers with 7-inch screens are expected in the second quarter ending June 30 from electronics manufacturers such as Samsung, Founder and Asus. Wharton marketing professor Eric Bradlow suggests that Microsoft has a sales challenge convincing consumers they need another device that is a “tweener” between a laptop and a handheld. Research firm Gartner notes that the UMPC may not reach its potential for another two years when battery life improves and prices come down.”]