Libre Office is about 95% compatible with Microsoft Office and
the few format areas it's incompatible are less than the amount of incompatibility that exists between several versions of Microsoft Office. Even so, the only time the incompatibility shows is minor formatting when you send a file from one to the other without saving it in the specified MS Office variant the other person uses - and then you get the exact same format problems between MS Office versions anyway. For the majority of organisations if they used Libre Office within their organisation as a whole there would be no significant compatibility issues to worry about as they would only come when sending a file electronically out of the organisation as a MS Word document.
Not everyone is aware there are options outside MS Office due the MS advertising. Also, bot everyone wants the ribbon and have significant issue with moving to the ribbon based versions of office. I know of two large worldwide organisations that have dumped MS Office simply because it was causing way too much trouble for the staff. They switched to Open Office and then Libre Office and have had no compatibility issues at all. In fact, the one area they expected problems has not occurred due to the fact they switched and now use the Open Document formats as their default as many European organisations now use the Open Document formats as default and MS Office has evidenced issues in that area.
