In addition the question asks only if it can be done in general not how (neither does the existing answer say how), and about other problems (dual boot), so I decided to post the question again as specific question just about the activation process. The latest question/answer I could find here on superuser is this one: XP Activation and Dual Booting which doesn't provide an answer to my question. The phone number is not valid for activation anymore (I tried the German one) and the online activation does not work either (in a quick test within a DMZ other protocols like ICMP or HTTP worked fine when I accessed an internet server). The 'regular' methods provided with XP (phone and online) don't work anymore. What Options are there to activate Windows XP nowadays?
