Microsoft’s messaging on the subject hasn’t done it any favors, either. Its end-of-support page for Office 2019 for Mac, originally posted in October 2023, once told owners to “Rest assured that all your Office 2019 apps will continue to function.” A revision now dated May 15, 2026 has dropped that line, replacing it with a note that their data “can be accessed in a supported Microsoft 365 or Office product.”


But EuroOffice is a fork of open source OnlyOffice?
And about ODF; well, it was first (standardized), then MS panicked and made their own version. But with foot angles and it shoots you in the face, because MS ignores their own defective pseudo-standard nowadays.
LibreOffice have specifically called them out, so I guess the support isn’t as good for ODF as it is for Microsoft’s OOXML.