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Are you you looking for a private office suite? Try Libreoffice
(www.libreoffice.org)
Privacy has become a very important issue in modern society, with companies and governments constantly abusing their power, more and more people are waking up to the importance of digital privacy.
In this community everyone is welcome to post links and discuss topics related to privacy.
[Matrix/Element]Dead
much thanks to @gary_host_laptop for the logo design :)
LibreOffice is compatible with Microsoft's OOXML spec. They sold every suite on it in the nearly 20 years ago to stop fines from the EU. They sold competing suites on it instead of using anything else available.
Microsoft however never actually fully supported their own spec and will save as "OOXML Transition" or whatever they call it now because they've been in 'transition' for nearly 20 years but still have proprietary blobs inside of it. You can however make MS Office save in OOXML Strict which is supposed to be compliant to the now ISO spec that LibreOffice actually supports.
This isn't LibreOffice's fault.