Microsoft's Handheld PCs and Palm-size PCs did not gain much success in the markets compared to Palm, with users complaining the Windows CE software were hard to use and the devices themselves were thick. On April 19, 2000, Microsoft introduced Pocket PC with a revamped interface and to better compete against the popular Palm devices. The Pocket PC was based on the all new version 3.0 of Windows CE. HP, Casio and Compaq were the first OEMs with Pocket PC devices in 2000. The familiar desktop Windows UI from Palm-size PCs was removed in favor of a more tailored interface on Pocket PCs.