I originally tested the Yahoo! Go mobile client on a Windows Mobile Pocket PC. Tonight I finally got around to testing it on a Windows Mobile 6 smartphone. I used an HTC S710 (aka Vox) so that I could see it in both portrait and landscape modes. Unfortunately, it turns out that Yahoo! Go does not support the WM6 smartphone (Standard Edition) in landscape mode. In fact, the display gets so messed up that switching back to portrait mode results in that display being unusable too.