So what info does WinXP really send to MS?
Quote:
Germany's tecChannel has launched an English-language version of its site, and has celebrated with a seriously trainspotter analysis of the interaction between Windows XP's product activation and Redmond central control. Despite (or possibly because of) Microsoft's insistence that the WPA process is completely harmless and doesn't send the company any of your personal data, the system has since its introduction been the subject of much paranoid speculation.
Quoted from : Here