Unbelievable. I can get Windows XP Service Pack 2 CD for free? Or does it mean that I can order it for free? The CD order page quoted:
Thank you for your interest in the Windows XP Service Pack 2 CD. Microsoft will ship the CD to you free of charge.
— http://microsoft.com/windowsxp/downloads/updates/sp2/cdorder/en_us/
I guess I'm not dreaming then. I give it a try anyway, and see if it arrives at my doorstep by next 4-6 weeks.