I too agree with all the complaints mentioned above. I'm facing a wasted morning as I now can't edit a file for a client who will almost certainly have compatibility issues. Not to mention that these "Modern" comments add to my workload: editing a comment now requires me to go to the More menu, then Edit, adding extra keystrokes; same w/ resolving the thread. Visually, there's now three panes instead of two, which takes up too much space on my small laptop. I can't increase the font size of my comments (this is an issue across MS products--we don't all have 18-year-old eyes). And, like millions of people, I don't need to "Start a conversation" while editing: all of that collaborative stuff is useless (and unwanted). Why would you roll this out without an easy way to switch to classic comments??! It's incredibly annoying. Instead, the onus is on the paying customer to waste more time tinkering with reverting back to a previous of Word, something that's a bit complicated for me, judging by the link above. PLEASE issue an upgrade that allows for classic balloon comments SOON. If it ain't broke, don't fix it!