The Austrian Armed Forces have been preparing for the switch to LibreOffice for a long time. Other LibreOffice users will also benefit from this.
Archived version: https://archive.is/newest/https://www.heise.de/en/news/Austria-s-armed-forces-switch-to-LibreOffice-10660761.html
Be interested to know how they migrated Excel accurately. That’s the killer app for Office and what makes migration difficult.