True, I had a large contract recently with this issue, but it worked out in the end.

The problem is that we thought "let's switch to the online MS Word editor", which then proceeds to delete your text as you write [1]. Bare in mind that my company pays an Office subscription per employee for that crap.

[1] https://www.reddit.com/r/Office365/comments/11be6wd/firefox_...

[2] https://answers.microsoft.com/en-us/msoffice/forum/all/how-c...

Try ONLYOFFICE Desktop, it is open source and has superior compatibility with MS Office.

There are considerable formatting issues when you're working collaboratively on documents with other people who use MS office when you are using MS office too.

We gave up for large documents, assigned an editor and just send them chunks of text.