Windows Whistler
In June 2000, Microsoft began the technical beta testing process. Whistler was expected to be made available in "Personal", "Professional", "Server", "Advanced Server", and "Datacenter" editions. At PDC on July 13, 2000, Microsoft announced that Whistler would be released during the second half of 2001, and also released the first preview build, 2250. The build notably introduced an early version of a new visual styles system along with an interim theme known as "Professional" (later renamed  "Watercolor"), and a hidden, early version of a two-column Start menu design. Watercolor was never meant to be the final theme for Whistler; in fact, it has been stated that Microsoft used it as a decoy until they were ready to show Luna. Build 2257 featured  the official introduction of the two-column Start menu, and the addition of an early version of Windows Firewall.