Windows Blackcomb

Build 5554
in July 2000 Blackcomb development begins, before Blackcomb is a development called Windows Saturn, which was the start of NT 6.1, Blackcomb may have more features than Whistler (later became XP). An OS reserved for the higher-end PC because it requires a minimum of 384MB RAM, a Pentium II processor at 266 MHz and 12Gb of HDD storage. Because it can contain the same functionalities as Windows Saturn.

Build 5554.1
Appeared on August 8, 2000 fixes the bugs of Windows Media Center for Saturn, with a new feature which is the clock that becomes dynamic.