@libreoffice One other point I'd like to make is that, given the current political and Wall Street climate in the U.S., the EU's response through passing the ACI, etc., I think breaking and eliminating dependence upon Microsoft and, in practice, any other American tech corporation, is in national, state, and even city-level security and economic interest.
I think adopting LibreOffice is a good first step, but you also need to switch to Linux, and Germany's own SUSE is an excellent choice.