This problem started with SP3 and continued on SP4. Even if there was new office released (2016), the problem is still here. My setup: SP4, dock and external full HD screen. If I boot the surface on external screen everything is ok, but when I disconnect the screen, office gets blurry on SP4 screen. It all goes away, when I restart the device. Same goes for other way arround: If I boot SP4 without external screen, everythins is nice, but when I dock it, I get blurry office fonts. For same reason it's impossible to use SP4 with extended screen option, because half of it is blurry if you use office. Here is an official page for this problem: Office apps appear the wrong size or blurry on external monitors - Office Support I find this problem scandalous, since MS's own SW doesn't work on it's HW like it should. I have little/no hope, but..did anyone find any solution to this?