Microsoft changed the default font in office applications to Aptos [1], and we don’t have a compatible replacement available. That makes documents incompatible across applications.
I attended the Collabora talk [2] this morning and learned that a development is at least ongoing. In my opinion this is a great opportunity to join the effort with financial contribution. Given the current situation is “complex” we might spend money into a shared pot, meaning to spend it at the design company.
[1] 162872 – Add "Source Sans" to VCL.xcu fallback font list for "Aptos"
[2] Shiny new things in COOL and other LibreOffice Technology news :: LibreOffice Conference 2025 :: pretalx