These keys have been tested to work.
In order to use these keys, you need the right edition of Windows XP/2003. Not just Home/Pro/Enteprise/etc, whether it's a Retail, OEM or Volume version. There's a clear cut way to check this.
If you see this, you have a Retail copy.

If you see this, you have an OEM copy.

If you see this, you have a Volume copy.

Not finished!
| Operating System | Edition | License | Key |
|---|---|---|---|
| Windows XP | Home Edition | Retail | XMCM6-DKYCQ-2BHQH-4PCHR-TBJCR |
| Windows XP | Home Edition | OEM | |
| Windows XP | Home Edition N | Retail | |
| Windows XP | Home Edition N | OEM | |
| Windows XP | Home Edition KN | Retail | |
| Windows XP | Home Edition KN | OEM | |
| Windows XP | Professional | Retail | |
| Windows XP | Professional | OEM | |
| Windows XP | Professional | Volume | |
| Windows XP | Professional N | Retail | |
| Windows XP | Professional N | OEM | |
| Windows XP | Professional N | Volume | |
| Windows XP | Professional KN | Retail | |
| Windows XP | Professional KN | OEM | |
| Windows XP | Professional KN | Volume | |
| Windows XP | Media Center | OEM | |
| Windows XP | Media Center 2004 | OEM | |
| Windows XP | Media Center 2005 | OEM | |
| Windows XP | Tablet PC | OEM | |
| Windows XP | Tablet PC | Volume |