Agreed compatibility with MS Office is always "the stumbling block" for the average user. When the Munich transition was made LibreOffice (OpenOffice) didn't handle Office compatibility too well. These days compatibility is much better. But that is not the issue, too many people sling .docx files around, not really understanding what they are doing. Document collaboration is more typically emailing and at best using the review functionality.

In my experience even reasonably computer literate people need to be asked, repeatedly, to send me documents as .PDF not .DOCX. Hate to think how hard that would be when we are dealing with hundreds of disinterested public servants.