I am going to have to correct you here. There is NO difference between XP Pro and XP Pro Corporate Edition EXCEPT for the licensing.

XP Pro is licensed for one individual. They can re-install it numerous times with the same product key. The "Corporate" edition is a volume license for install in large offices with robots at cubicles.

How do I know this? I was the "guy" that did the purchasing, installation and upgrades of hundreds of machines in a BIG corporate setting.

Lets not confuse people here if we can help it.