Windows Vista build 5209

Windows Vista build 5209 is a pre-Beta 2 build of Windows Vista. It was presented by Steve Ball in the Channel9 video, Learning about Audio in Windows Vista, which demonstrated the new audio features in the operating system. This build oddly still uses the "Microsoft (R) Windows (R) Codename Longhorn" build tag despite being compiled after builds 5112 and 5212.

Video notes

 * 1:37 Audio stack mentioned
 * 2:12 Some mention of 'interesting things could be found at the keynote' (PDC 2005)
 * 2:25 to 3:02 the Neptune project is mentioned.
 * 4:10 Discussion about UI.
 * Desktop volume control comparing this system in Windows XP (first seen 4:23) and Vista