Watercolor

Watercolor (also known as Business or Professional) is the name of a placeholder visual style created by Microsoft during development of the Windows XP operating system. Contrary to popular belief, the first known build to include it was build 2223, however, there was no user interface to enable it and it was largely incomplete. By build 2250 the Desktop control panel was enhanced to support the new visual styles and therefore it's commonly mistakenly considered to be the first build to include Watercolor. The last known build to include it was build 2419.

Early Watercolor was a dark blue and gray theme quite reminiscent of the Windows 2000 color scheme. This was later changed around build 2257 to use brighter shades of blue with red frames for disabled windows.

Despite the theme being removed from Windows XP builds after the introduction of Luna, it was still included in the source code of both Windows XP and Windows Server 2003.