Luna

Luna
	Microsoft Windows visual style
	Luna in Windows XP build 2600
	Olive Green variant
	Silver variant
Included in	Windows XP
First seen in	Windows XP build 2415 (Lab06 N)
Last seen in	Windows Vista build 5059 (vbl_wcp_avalon)

Luna is the main visual style used in most editions of Windows XP. Prototyping for the theme started in 1999 and it was officially unveiled on the CES 2001 conference in January 2001. The first available build to include the visual style was Windows XP build 2428, where it replaced the previously included Watercolor and Mallard placeholder themes.

The final variant of Luna was first demonstrated at a Windows XP Expert Zone briefing in May 2001. There are various slight differences between the preliminary and final version, most importantly the lack of color schemes other than blue in the preliminary variant, while the final version also includes the Silver and Olive Green color schemes. The preliminary version is also slightly more glossy than the final one.

The theme was also present in all pre-reset Longhorn builds as well as early post-reset builds. The last available build to include the theme is build 5048, which uses a different graphic for the Start menu right pane taken from the Slate theme for an unknown reason. Build 5059 is the last known build to include the theme, as it was demonstrated on the WinHEC 2005 conference with the Olive Green variant set.

The newer Royale theme introduced in Windows XP Media Center Edition 2005 retains the overall dimensions and look of Luna while using more contemporaneous visual effects. The Slate theme used in later pre-reset Longhorn builds is also partially based on Luna, although it is different in some aspects such as the window caption font.

The Sticky Notes app used a Luna inspired theme up to Windows 7. Some elements of Luna, such as the window frame and color scheme, have also been adopted in contemporary Windows CE versions.