the first version was pocket pc 2000, released in april 2000. it was based on the kernel of windows ce 3.0 (handheld pc 2000). then came pocket pc 2002, released about two weeks before windows xp. it was similar to 2000, having full compatibility with windows ce. windows mobile 2003, released in april 2003, was the first version called windows mobile. it was software-compatible with windows