Free office suite – the evolution of OpenOffice. Compatible with Microsoft .doc, .docx, .xls, .xlsx, .ppt, .pptx. Updated regularly, community powered.
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.
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.