Windows 2000/5.0.1515.1

Windows NT 5.0 build 1515.1 is the earliest leaked compilation of Windows NT 5.0. This build has been leaked only in Workstation (later called Professional) SKU.

One of the most interesting features in this build is the "Show desktop" button on the end of the Taskbar (similar to what we can see on Windows 7's Superbar). The Internet Explorer 4.0 Platform Preview build 4.71.0603.0 is included, but it has a timebomb.

ACPI
The ACPI driver is broken in this build.