Greetings
The OEM version has the following disadvantages/differences
1. Its license ties it permanently to the first computer it's
installed on. It can never legally be moved to another computer,
sold, or given away.
2. It can only do a clean installation, not an upgrade.
3. Microsoft provides no support for OEM versions. You have to
get any needed support from your OEM, and that may range anywhere
between good and non-existent.
Assuming a generic OEM version, rather than one customized by a
specific OEM, in all other respects they are the same.
[Courtesy of Ken Blake MS-MVP]
John in VA said:
I am building a P4 system that will have WIN XP Pro as the
OS. Is there a difference in the installation and
operation of XP Professional OS using the OEM version vs.
the retail upgrade package?