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 now and then, 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.