I used to work for Oracle. I can recall Oracle sales reps telling me how important it was that we internally used the software we sold to our customers, because if we didn't trust it with our own business, why should they trust it with theirs? Maybe Microsoft doesn't think the same way?

Of course, Oracle has so many different software offerings (duplication due to acquisitions, and lots of industry-specific offerings), it couldn't possibly use them all internally. But at least its sales reps could say, that if they weren't using the specific product they were selling, they'd be (for non-industry specific functions) using an equivalent product in Oracle's portfolio.