I think for Windows Mobile, their persistence and slowness made them fail. They kept trying to improve Windows CE based systems (not going to list all the renam

I think for Windows Mobile, their persistence and slowness made them fail. They kept trying to improve Windows CE based systems (not going to list all the renames) which were a very poor base to build on. When they finally decided to switch to a new OS/GUI they were slow and managed it badly. When it came out and they had good hardware as well they were way too late.