STEPS TO REPRODUCE
* open blank document in Word (or new e-mail message in Outlook)
* enter "This is a sentence with some non-std characters; æ, å and ü are fun"
* observe text formatting
* all entered in default font (Calibri)
* all text *but* the special characters are entered in Calibri. The others are formatted with Times New Roman
Æ, ø and å are normal/frequently-used glyphs in Norwegian and have direct/single-key entry on a Norwegian keyboard layout.
For some strange reason, they suddenly appear in Times New Roman!
This is a relatively recent change in behavior—was definitely not like this from the start (Win10 & Office 2016). It could be (but I won't swear it is) related to Win10 anniversary update.
I'm running Win10-64, English OS language, Norwegian locale & regional settings on a Lenovo X1 Yoga.
Office 2016 (MSO 16.0.7127.1026) 32-bit.