That was XP, and that was the beginning of my separation from Microsoft stuff in earnest. The Windows XP background and UI is a source of nostalgia for millennials just like Windows 3.x, old-school Mac, or Amiga would be for people my age... but I feel no nostalgia at all for it because I let that generation of Windows, and most subsequent ones, simply pass me by, fortune having smiled upon me and enabled me to work in Linux almost exclusively since around that time.