Windows Vista build 5054

Windows Vista build 5054, with a buildtag of 5054.vbl_ux_nisd.050404-1730, is a build demonstrated at WinHEC 2005 to demonstrate the new speech recognition capabilities of Windows Vista. The new capabilities include improved accessibility, new mobility scenarios, and improvements to the speech user experience. Only one image of this build has been shown.

Trivia
In Windows Vista, Windows 7, Windows 8, Windows 8.1 and Windows 10, the  file has this build of Windows Longhorn in its file properties. And it doesn't contain a buildtag, however it's unknown.