"David Morgan (MAMS)" <email@example.comC/Odm> wrote in message
> "Kerry Brown" <kerry@kdbNOSPAMsys-tems.c*a*m> wrote in message
>> "chucky2" <firstname.lastname@example.org> wrote in message
>> > My uncles business has an old machine running XP Pro SP2 OEM that
>> > simply
>> > cannot handle old software anymore, so I'll be building him a new
>> > modern
>> > machine.
>> > The problem is the software he needs to run doesn't run on Vista, it's
>> > a
>> > known issue.
>> > We'd like to buy Vista Business OEM for the new machine for future use
>> > (when
>> > the software finally works on Vista), but use his XP Pro SP2 OEM disk
>> > and key
>> > on the new machine, and also on the old.
>> > I know this is in effect using the same key on two completely different
>> > machines, however two licences have been purchased so I'd think this
>> > should be OK with Microsoft.
>> > Does anyone know if this is legit legally and if is, from a Windows
>> > Update/Validation point of view?
>> > Thanks either way!
>> Yes, that's possible and legal. Vista Business has downgrade rights to XP
>> Pro. Even though you installed XP using a key from another computer the
>> license is actually from the copy of Vista you have. You will have to
>> in for activation of XP and explain that you are exercising your
>> rights from Vista.
> So the actual VISTA key will NOT activate XP ?
> And if the key is used for such by phone, then VISTA can no longer be
The XP install won't finish unless you provide an XP key. Keys are specific
to the version, i.e. an OEM XP Pro US English key will only work with that
exact version of XP.
The Vista key never gets used or entered anywhere. If at some later point
you wish to install Vista on the same computer it will work. The key point
is that as you are using OEM software you can run Vista or a downgrade to XP
Pro on that computer with that license. Keys are not licenses and vice
versa. You have a license to run Vista business on that computer. Part of
that license says that you can downgrade to XP Pro on that computer. You
can't install XP Pro and Vista at the same. It's one or the other and only
on that computer. My advice is to take an image of all the partitions on the
disk and store it away for future use. Format the drive and install XP Pro
using the key from the other computer. Phone to activate it and explain what
you've done. It should be activated. If they won't point them to the link I
posted. When you want to return to Vista restore the image you created. Note
that the downgrade rights are very specific. You can only downgrade from
Vista Business or Ultimate to XP Pro, Tablet, or Pro x64. You can't
downgrade to XP Home or media Center. Nor can you downgrade from Vista Home
basic or Premium.
Microsoft MVP - Shell/User