pjarvi said:
You can upgrade an OEM version all you want.
What I was saying you can't do with an OEM is upgrade an existing OS.
e.g. if you wanted to upgrade a Windows 98/2K install to XP, you could do it with media from retail product (upgrade version or not), but not with OEM.
OEM requires you to install to an empty drive or partition.
Whether you can upgrade that to Vista or beyond, depends entirely on the details of the OEM license and Vista's license when it is released. Unfortunately the individual OEMs all have variations on a theme, and the EULAs can be quite different. e.g. my Dell OEM license gives me downgrade rights, which usually are not granted with OEM licenses.
B