 Its origins dated back to Windows CE in 1996 , though Windows Mobile itself first appeared in 2000 as <unk> 2000 . It was renamed " Windows Mobile " in 2003 , at which point it came in several versions ( similar to the desktop versions of Windows ) and was aimed at business and enterprise consumers . By 2007 , it was the most popular smartphone software in the U.S. , but this popularity faded in the following years . In February 2010 , facing competition from rival OSs including iOS and Android , Microsoft announced Windows Phone to supersede Windows Mobile . As a result , Windows Mobile has been deprecated . Windows Phone is incompatible with Windows Mobile devices and software . The last version of Windows Mobile , released after the announcement of Windows Phone , was 6 @.@ 5 @.@ 5 . After this , Microsoft ceased development on Windows Mobile , in order to concentrate on Windows Phone . 
