This about oem is true?

"A Microsoft representative confirmed that users may buy an OEM copy of
Windows Vista at a substantial discount, provided they adhere to the terms of
the license - which, incidentally, may mean providing support for family
members. In addition, users should still be subject to the same familiar
re-activation restrictions as users of a retail Vista license and Windows XP,
a spokeswoman said. Users can alter the PC's hardware substantially, but they
will be forced to reactivate - not repurchase the OEM software - if they do,
she said."

Thanks
Marco