Microsoft will not be offering an upgrade version of Windows 7 in Europe.
In the past Microsoft has given people already using Windows a chance to upgrade to a new version when it becomes available.
While that option will be offered in the US, Microsoft said its efforts to comply with competition regulations meant it could not do so in Europe.
European regulators dismissed the claim, saying the move limited choices rather than opening them up.
No choice
Windows 7 is due to go on sale on 22 October around the world.
Anyone outside Europe buying a new PC between now and then - running Windows Vista Home Premium, Business or Ultimate - will get the chance to upgrade the operating system on it, at no cost, to Windows 7.
While Microsoft will not charge for the upgrade, some PC makers may impose a fee to ship disks with Windows 7 on them to customers.
The worldwide upgrade option programme is due to begin on 26 June
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