What I can tell you, is that when I work with switchers, this is how it goes:
The most important thing to remember about switchers is that the state of being a switcher is a transient state. Everything on their Mac is different, and so while they're asking why Office is different, they're also asking why the Finder is different than the Windows Explorer. After all, the Finder is doing the same thing as the Windows Explorer (certainly from the point of view of someone new to the platform), so why should it be any different?
After using a Mac for a pretty short period of time, usually no longer than six months, a switcher becomes a Mac user. Even though they expected Office:Mac to behave like WinOffice at the beginning, they now expect Office:Mac to behave like the rest of the Mac applications that they've started to use.
Even for those users who frequently switch back and forth between their Mac and a Windows computer (say, they use Windows at work and have a Mac at home), they still behave like a Mac user when they use their Mac. I think of it as being similar to being bilingual: if you're fluent in two languages, you think in one language when you're surrounded by it, and you think in the other language when you're surrounded by it. Left to your own devices, you probably default to one or the other, but you can work equally well in either of them.
For the tiny minority of people who really want Office:Mac to behave as a Windows application, but somehow want the rest of their Mac apps to behave as Mac apps and also don't want Office:Mac to be integrated with their Mac in any way, I have to wonder why they have a Mac at all.
Nadyne, I know that you mean well so I will offer you this. I work with military and government types. At work they have PCs. When taking work home, they don't want to spend the time learning a different interface from work. It's simply not worth it to them. The same holds true for those I know who work in Fortune 500 companies.
I know you mean well too. I'm unsure why you think that someone with my title and who has been doing my job for as long as I have would be unaware of this.

I have personally conducted thousands of hours of research with Mac users, all across the spectrum from soccer moms to military types (the highest rank of someone with whom I've done research with is a Colonel) to artists to students to business owners to C-level executives. I've done research with people who have owned a Mac for less than four weeks, and with people who have owned one for 15 years.
There is a huge sales potential being completely missed by Microsoft because the Mac and PC versions are not the same. Just think of all the individuals out there in government, military and Fortune 500 types that would love to use the Mac version of Office at home decide it is better and much easier to use the Windows version because it's obviously 100% compatible, has Access and Outlook. Anyhow, I hope someday that Microsoft will consider releasing cross platform, 100% compatible, office suite that includes Excel, Word, PowerPoint, Access and Outlook. I know that I am probably dreaming, but what the heck?
You keep on asserting this, but you haven't backed this up, other than with anecdotes of people who you have talked to who have recently switched. Anecdotal data isn't sufficient to make a major change in business direction. Given the weight that you put on Access, which has a relatively low rate of usage for Windows users, I have to question the assumptions that you're making about WinOffice users, let alone the potential that this has for Office:Mac.
Office allows for customization of menu bars and such. Why not simply have a toggle that allows Mac like interface for those who want it and an identical PC interface for those who have to use each on a daily basis. While it would take a bit to implement this, it is not rocket science.
The cost of developing two interfaces for the same platform is very very high. Further, the number of requests that we receive for exactly identical interfaces across two platforms is extremely small. The opportunity cost of developing two different interfaces is, at this time, higher than we've been willing to bear. I'd rather have the developers who would work on such an exercise spend their time on something that is more likely to have a greater impact on a larger number of users.
Regards,
Nadyne.