We have our own mailserver hosted with our provider.

In very short: LibreOffice is an open-source fork of OpenOffice but is und stable development whereas OpenOffice is falling behind (for example if you have to work with MS Office files OpenOffice won’t be a big help but LibreOffice can also properly write files like XSLX)

Moved my work-setup to Ubuntu and haven’t regretted it a second! Just wondering-really OpenOffice and not LibreOffice?

Im the owner of a small startup and I am working only with Linux and Nextcloud (and so are my 4 employees) - it’s doable and it’s a great feeling!