Mike said:
Actually it is also allowed under Vista Ultimate too (both retail and
OEM) - it is covered in the EULA
Home Basic, Home Premium and Ultimate share the same EULA (with bits
specific to each edition covered)
http://download.microsoft.com/docum...lish_d16c019b-fa71-4fc9-a51d-a0621bddb153.pdf
I see nothing in that EULA that states downgrade rights are provided.
However, looking at
http://download.microsoft.com/downl...9d-4996-b198-7b9d3fe15611/downgrade_chart.doc
I see:
OEM license of Systems Software:
"Rights to OEM versions of systems software are granted in the OEM
License Terms. The OEM License Terms for most OEM versions of systems
software do not grant downgrade rights. The exception is the OEM License
Terms for the Windows® XP Professional operating system and the Windows
Vistaâ„¢ Business and Windows Vista Ultimate operating systems, which
grant downgrade rights. See the full text of the OEM License Terms for
the specific downgrade rights."
FPP (Full Packaged Product - aka Retail) Systems Software:
"Downgrade rights are not granted under FPP system licenses."
So, I was wrong. Downgrade rights exist for OEM copies of Vista
Business and Vista Ultimate - no downgrade rights exist for retail products.
David