Windows Mobile

Windows Mobile is a series of mobile operating systems released by Microsoft during 2000 to 2009. It is based on Windows CE's kernel. It was succeeded by Windows Phone 7 in 2010, which is also CE-based but features a completely different interface.

Pocket PC 2000
Pocket PC 2002 was released in 2000. At this point, it does not use wallpapers on its today screen, instead featuring a graphic at the top consisting of a horizontal green-blue gradient with a smaller blue-orange gradient underneath.

Pocket PC and Smartphone 2002
Pocket PC 2002 was released in 2001. Its default wallpaper is an abstract light blue background of lines featuring the text “microsoft mobile” aligned to the right, facing vertically. It also includes an additional theme, Fire. Pocket PC 2002's smartphone counterpart, Smartphone 2002, was released the following year.

Windows Mobile 2003
Windows Mobile 2003 was released in 2003, serving as the first version to unify both the Pocket PC and Smartphone versions under the Windows Mobile branding. The default wallpaper of the PDA version is an edited version of Bliss, featuring different clouds and the Windows flag in the bottom right corner. The smartphone version features a completely different background, featuring white bent lines over a blue background, also featuring the Windows flag. Both versions also include an additional theme, Spiral.

Windows Mobile 2003 SE
Windows Mobile 2003 SE was released in 2004. The default wallpaper of the PDA version is similar to the wallpaper of Mobile 2003's Smartphone version, albeit larger and comes in different sizes depending on the device's resolution. The smartphone version of the wallpaper is also similar to the previous one, but with slight differences. Both versions also includes an additional theme titled Bliss, which is a brighter, more cropped version of said wallpaper while featuring a small Windows flag.

Windows Mobile 5.0
Windows Mobile 5.0 was released in 2005. The default wallpaper of the PDA version is a background of abstract bent blue lines. The smartphone version follows suit, albeit with an added white gradient at the top. Mobile 5.0 also includes an additional theme titled Guava Bubbles. It is also the first version of Windows Mobile to include two sample pictures, Flower and Waterfall; like the default wallpaper, these were included at different resolutions depending on the resolution of the device.

Windows Mobile 6.0
Windows Mobile 6.0 was released in 2007. The default wallpaper is a radial teal gradient. It also includes two additional themes, Windows Mobile Green and a newer version of Guava Bubbles, featuring a red aurora wallpaper instead. The sample pictures introduced in 5.0 are also present here.

Windows Mobile 6.1
Windows Mobile 6.1 was released in 2008. It does not add any new themes, although it features a new default wallpaper which is very similar to Windows Mobile Green except with less gradients present and has a darker shade of green underneath. While the Professional version retains the 5.0 sample pictures, the Standard version (which appears to have a more developed UX overall in comparison) introduces four new sample pictures and removes the previous two: Grass, Leaf, Spring and Water. It is unknown where they were taken from, but they were most likely taken by Microsoft employees.

Windows Mobile 6.5
Windows Mobile 6.5 was released in 2009. The default wallpaper is a blue-orange background featuring an aurora somewhat reminiscent of those in Windows Vista's branding elements. It also contains a selection of themes with wallpapers created by prestige fashion designers. The Professional version replaces the 5.0 sample pictures with the set introduced in 6.1 Standard, which are also retained in the Standard version of 6.5.