I had a brief glitch with the "Mail" app in Windows 10 yesterday.... combined of course with the same glitch in the "Calendar" app.
Checking the "Store" app I found a mail and calendar update pending and apparently hung. I simply paused it, waited a brief moment or so and then resumed them.
It installed then and afterwards the mail app and calendar app worked.
Not sure if you might be experiencing the same thing, but it might be worth looking into.
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