To toss in my experience...
I am running a dual installation of Office 2007 Pro and Office 2003 Pro on
my XP work laptop. However, I have ONLY Outlook 2007 installed, which is
apparently a critical ingredient of the recipe.
I won't say I have any horror stories, but I will report that my machine is
a little less stable than before. But, on a normal day, I work in Word 2003,
Word 2007, PowerPoint 2003, AND PowerPoint 2007 concurrently without any
issues.
With that said, I have not tested this with 2000, so if you can heed Bill's
advice about a Virtual Machine, I highly recommend it.
Cheers
--
BO Haynes
Microsoft Master Instructor (MMI)
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