I know what ClearType is, i just don't like it. For my personal taste letters (or fonts for that matter) always look a bit fuzzy in Clear Type and i don't have that whan i don't use ClearType.
I always prefer the Black & White text examples instead of the offered ClearType when put next to each other. "For me" it just looks a lot better.
Maybe i should get used to it because Microsoft is pushing this more and more to be non-changeable (ex: Internet Explorer and now the menu's in Win10). I just stopped using Internet Explorer because of that (started on IE 8) because they pushed their own fonts over the (still changeable) Windows font settings.
The problem in Office did not exist in any of my previous setups (from Win95 all the way to my previous install Win8.1Pro upgrade to Win10). It only showed since the new fesh Win 10 install.
I'm also eager to install Office 2013 again to see if there's a difference.
But i go for a few older drivers first.