Not saying it was the biggest reason, but Microsoft was supposed to kill Windows XP around that time, and it went back on its decision when netbooks started app

Not saying it was the biggest reason, but Microsoft was supposed to kill Windows XP around that time, and it went back on its decision when netbooks started appearing on the market. Windows Vista and even Windows 7 weren't very adequate for those machines performance-wise, but they thrived on Windows XP.