The version used in Longhorn has noticeably been heavily cropped, making the tree fill up more of the wallpaper.
It depicts a tree at what is most likely Canada during springtime. It was taken by Andre Gallant, who also took TREE AT THE FOUR SEASONS IN WINTER (used in a Longhorn demo) and Windows Vista Starter's img725. Originally known as TREE, THE FOUR SEASONS IN SPRING, it was licensed from Getty Images. The default wallpaper of Longhorn in the WinHEC 2004 build and builds 4083 to 4093. Rights-managed (no longer commercially available)
Longhorn WinHEC 2004 build, builds 4083-4093 default wallpaper