An article is posted at PC World about a user who had bought Windows XP Pro operating system (OS) from an online company. He checked it with Microsoft Genuine Advantage Tools and it was pronounced as legitimate. However, over a year later, he got a message that his OS is no longer legal.

“If Microsoft declared my copy legal in 2007, it should stay legal. Why is this such a wishy-washy situation? Now I can’t get updates and if I have to reinstall the operating system I won’t be able to,” says William.

Source: PC World