Hire a very good UI\UX Design firm! Engineers OBVIOUSLY don’t know how to build an intuitive interface! Clearly, they lack the skillset.
Microsoft SUCKS at UI\UX design, always has. I'm not trying to be offensive, it's just a statement of fact.
PLEASE! PLEASE! PLEASE!
Hire a highly awarded, VERY good UI\UX design firm! It will be worth every penny in goodwill and saved support costs, guaranteed.
K E Y C O N C E P T (PAY ATTENTION!)
Microsoft has NEVER successfully created an intuitive software interface nor a pleasant user experience. The reason is that you aren't designers. You have no business making drugs, likewise you shouldn’t waste time and money on designing UI\UX! Neither are your core competencies. The interface and experience are, however, incredibly important to the success of your products. The reason you are not good at it is because, just like engineering and software development, it takes a decade or more of formal and independent education, practice and failure to become good at it. Greatness takes even longer. The majority of people are not engineers or coders and we think differently from same. Your UI\UX design efforts from the very beginning have failed because they have never been anything close to intuitive to the average user. This is a critical element! Engineer ”intuitive” is VERY different from the rest of us. This isn't bad, unless you're designing UI\UX.
So PLEASE heed this advice and save yourself a ton of time and money while making the rest of us SO much happier!