Microsoft Windows XP Professional Version 2002 OEMSerial Number Location

I bought Microsoft Windows XP Professional SP3 English for System Builders 1 Pack CD - OEM from Newegg http://www.newegg.com/Product/Product.aspx?Item=N82E16832116515

After opening the product and throwing away the wrapper, I started the installation and then looked for a license key. I couldn't find it anywhere! That's because Microsoft put it on the cellophane wrapper which was in my trash.

I happened to find the answer on Mac-Pro

http://www.mac-pro.com/Microsoft-OEM-Windows-XP-2002-Pro-DSP
After receiving your copy of Windows XP be careful not to throw away the "product key," which is printed on a sticker affixed to the outside of the software's cellophane wrapper. You will need the product key in order to activate the software.