Windows "Longhorn" 5098.winmain beta1.050628-1740 is among the last builds compiled before the Beta 1 stage of Windows Vista. By this point, Microsoft implemented a substantial amount of features originally slated for Windows "Longhorn", signifying the end of the Omega-13 stage.
This build includes the Windows Aero visual style, WDDM video drivers, Start menu updates, and the Games Explorer. This build notably includes the Network Computer Sharing (formerly Castle) feature. This build leaked in January 27, 2020 from Grabberslasher from his builds on his blog.
Gallery
Start menu and About Windows dialog box
Windows Explorer demonstrating Virtual Folders, new icon viewing modes, and the Details Pane
Links in the Control Panel
An AERO Wizard to start Network Computer Sharing
The animation for Network Computer Sharing illustrating peer-to-peer account replication
