Luna

Luna is the visual style that shipped with Windows XP (with the exception of the Starter SKU and the IA-64 releases) and some builds of Whistler (starting with build 2415 and then from build 2428 onwards). It was also available in Windows Server 2003 (starting with at least build 2430, though disabled by default), and all Longhorn builds up to build 5048 (although the new taskbar and sidebar when enabled would still display in the Longhorn Plex/Slate style). One of the builds where it made its possible last appearance was Windows Vista build 5059 (vbl_wcp_avalon) however the build is not confirmed. Notably in Longhorn, the Windows logo on the Luna 'start button' is all white rather than colored as it was in Windows XP. It is known as "Windows XP theme" in the Control Panel.

Luna in Windows XP (build 2481 onwards) had three color schemes: Luna Blue (the default), Luna Silver, and Luna Olive Green. While Royale, Royale Noir, Zune, and Embedded are separate themes found in other operating systems based on Windows XP, with each one of them having different color schemes to the default Luna theme.