I also have received confirmation emails for Vista Business & Office 2007 PRO.
To answer one previous question, AFAIK the Office activation system should let you
install and activate it on a different / replacement machine if/when you need to do that
as long as you stop using it on the previous installation. I'm not AWARE of any language
in the Office EULA that limits transfers from one machine to another, though I suppose
it could be that I just haven't heard of the limitation...
To answer another question about taxes -- if you as an individual get the 'gift' in
calendar year 2007, it'll be reported and filed with your tax return due for calendar
year 2007 which most people have due on April 15 2008.
If you filled out the W9 so that it's taxable to your business / partnership /
corporation / whatever, and if the business has a tax year that isn't on a calendar year
basis then you'd have to file the information about the received gift whenever is
appropriate for the next upcoming tax filing date for your business.
The Retail list price for MS Office Pro 2007 is ~ $499,
the Retail list price for MS Vista Business is ~ $299,
so that's about $800 of extra taxable 'income' to you for this tax year if you get both,
so you'll end up with about $200+ more due in taxes (e.g. in a 25% fed. bracket)
because of getting both than you'd otherwise pay.
Basically you get Vista at a slight discount and get
MS OFFICE for "free" if you base it on what you'll pay in taxes for both.