In addition to the compatibility point that someone explained, there is also the fact that XP is much lighter than his successors. I can install XP on a VM and

In addition to the compatibility point that someone explained, there is also the fact that XP is much lighter than his successors. I can install XP on a VM and get away with a few GBs of space; the last time I tried Windows 7 instead, the space occupied started to grow uncontrollably, even after making little changes.