After signing up HTC as an original design manufacturer, Compaq marketed the new PDA under its own brand, IPAQ, which was introduced in April 2000. This pocket device caught on with business professionals because it used the Windows CE operating system and could run Microsoft Pocket Office applications. Eventually, HTC made 2.5 million PDAs per annum for Compaq and also supplied it under the ODM arrangement for other computer companies like HP and Dell