Thanks everybody for your replies, you've been very helpful

I currently don't intend to migrate on a 64 bit machine; my question was
rather a curiosity of mine

Thanks again !
"Synapse Syndrome" wrote:
> "edgardumea" <edgardumea@discussions.microsoft.com> wrote in message
> news:824160D9-70CF-419B-95F4-3E269D4A67C9@microsoft.com...
> > Hi !
> >
> > A while ago I bought Win Vista Ultimate retail pack. It came with a 32 bit
> > version of the OS and the 64 bit version as well. Only one key.
> > I have already installed the 32 bit version & used the license key.
> > What if later, after I upgrade my computer with a 64 bit processor & so
> > on,
> > I want to reinstall Vista & decide to put the 64 bit version ? Am I
> > allowed
> > to use the same license key ? If not, why did the retail box came the 64
> > bit
> > version too ?
>
>
> If you want both at the same time you could install 64-bit and install
> VirtualPC (free) on that. Then you can install 32-bit as a virtual machine,
> as the Ultimate licence agreement allows that.
>
> ss.
>
>