I have Office 365 v1811 on a new Win 10 Pro 1809 computer for a client. I have an extensive set of buttons on my QAT that fit in Word 2010, but not in 365 v1811. After gleaning as many as I can I still need to get 6 more positions on the toolbar. While working the Options I noticed this version has a much improved Spelling and Grammar checker now called Grammar & Refinements. As an editor, this piqued my interest. However, since I use the full QAT constantly, not having it all fit on the toolbar is a killer, not to mention the icons are so washed out it is hard to see the differences.
So unless I can find a way to get more buttons on the QAT, I will stick with Word 2010.