Nothing unusual here except that Microsoft sells software for Macs. Sales and marketing can't use Macs to push Office for Mac?
From what we know, it's ridiculous to assume they haven't already got cases like this covered.
What about all those highly skilled marketing designers trained and experienced on Mac versions of software?
Which ones? Oh, right, none of us have any idea if these people actually exist within the company, and until we do, what you say is just an imaginary fabrication.
Policies that unnecessarily restrict the tool choices of creatives are wondrously wrongheaded. (Skilled artists and artisans aren't usually limited by their tools, but preferences exist nonetheless.)
The Adobe suite isn't exclusive to the Mac, you know. I could see your point if there was any particular lapse in Windows softare that the Mac's got covered, or if the operation of the system was vastly different, but none of those have been true for ages. I know Apple have been pushing the idea of the Mac as the machine of choice for creative, free spirits and artists, and both companies and individuals have swallowed the bait whole, but it just doesn't hold water any more.