1 'free upgrade' 2 machines

[Guest]

i recently bought 2 laptops for a small business from different companies.
Both are similar spec (could handle vista, even 64bit if wanted) but
unfortunately only one of them came with XP Pro - free Vista business
upgrade. The other came with XP home edition and no upgrade mentioned. I rang
the company i bought the machine from and they're not offering the upgrade
DESPITE microsoft offering it to companies to give away or sell for a small
fee over the holiday 'transition'.

Anyway... is there a way i can use the 1 upgrade key to get Vista business
on both machines? is there a cheaper way than just buying the whole vista
package retail style for the second machine? I really dont want to be
spending the full lot when i may not need to so i thought i would ask the
question here.

Thanks in advance.

 

[Guest]

Ignore that, it didnt show my other post worked until i submitted the second
a day later and then both appeared at once! Sorry.

Also thanks for answering Carey Donald, J-Jones - (very helpful)