Windows Vista build 5226 (vbl wcp avalon dev)

Windows Vista build 5226 is a pre-Beta 2 build of Windows Vista. This build was presented in the Windows Vista Sidebar and Gadgets video by Sean Alexander (and others) on Channel9.

The video focuses on the new sidebar of Windows Vista. The actual build is shown in the 3 - 10 minutes and then again on 15 - 20 minutes.

This build remains unleaked, having appeared only in a Channel9 video.