Just to offer some updates to this thread, you can still activate Windows XP and Office XP, however you will have to use the Telephone option to do so. I spent about a week restoring quite a bit of old systems, and had to use the Telephone option to activate as I kept getting the same error when trying to do so online (from what I understand, the Internet activation option has been taken down entirely, but the Telephone option still works).
Just call 1-888-652-2342 or 1-866-740-1256, respond to the automated system, and activate through your iPhone or Android. Same works for Windows Vista and Office 2003 and 2007.
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Just call 1-888-652-2342 or 1-866-740-1256, respond to the automated system, and activate through your iPhone or Android. Same works for Windows Vista and Office 2003 and 2007.
This is as of August 2020.