The easiest way to watch YouTube on a WM5.0 or WM6.x device is to input m.youtube.com into the Windows Mobile Standard or Professional phone’s mobile browser.

Then click the Link, “Download the YouTube application,” to download and install a YouTube client to your phone.

If you have a Windows Mobile Classic device that runs WM5.0 or WM6.1 (the classic devices are not phones), you can download the software directly to your device by entering this link address into your device’s mobile browser.

After you’ve installed the YouTube application, select/tap Start > Programs > YouTube

I’ve installed the YouTube application to two WM5.0 devices (IPAQ rx1950 & IPAQ hw6925) as well as to my WM6.1 Standard phone (IPAQ Voice Messenger) and my WM6.5 Professional phone (HP IPAQ Glisten).