 Windows Mobile 6 @.@ 1 was announced April 1 , 2008 . It is a minor upgrade to the Windows Mobile 6 platform with various performance enhancements and a redesigned Home screen featuring horizontal tiles that expand on clicking to display more information , although this new home screen is featured only on Windows Mobile Standard edition . This was not supported in the Professional edition . Several other changes such as threaded SMS , full page zooming in Internet Explorer and ' Domain <unk> ' were also added , along with a " mobile " version of the Microsoft OneNote program and an interactive " Getting Started " wizard . Domain <unk> is functionality to connect the device to System Center Mobile Device Manager 2008 , a product to manage mobile devices . Windows Mobile 6 @.@ 1 also had improved bandwidth efficiency in its push @-@ email protocol ActiveSync up to 40 % ; this considerably improved battery life in many devices . 
