Apply for Microsoft's Software Assurance
Bought a desktop with Windows XP Pro OEM on it during the last 180 days?
You may wish to consider adding Software Assurance (SA)
You can ensure have the rights to
Windows Vista Business or Enterprise upon their release later this year.
More affordable than upgrading down the track, it removes any OEM restrictions.
No information about the original purchase is required.
The grace period returns to 90 days from July 1, 2006.