[maxmsp] [OT] Bootcamp on OS 10.4

Apologies for the OT ness, but there is a connection - I want to run
Bootcamp in order to port some Max projects.
 Atm, I'm running OS 10.4.11; as I understand it, this 'upgrade' broke
Bootcamp on some, if not all systems. Whether or not this was a cynical
trick by Apple to make us buy Leopard, I don't know*, but I do still have a
copy of the Bootcamp beta for OS 10.4 versions prior to .11, so my question
is:
 is it possible to 'downgrade' to OS 10.4.10, and if so, will the old
Bootcamp still run, or did it actually have an expiry date ? Are there any
other caveats to attempting this, such as QuickTime compatibility or
suchlike ?
 I actually have a Leopard installer disc on my desk, but am reluctant to
use it whilst there is no supported version of pro Tools available (and even
when it does appear, I'll probably have to wait another six months whilst
Digidesign debug it )
Cheers
Roger

*The only reason I have to doubt this is that I can't imagine the Apple
marketing team supporting a campaign that ran along the lines of 'Buy
Leopard - it will enable you to run Windows!" ;-)