Comment by ivan_gammel

Plenty of server-side FOSS is mainstream. Maintainability of the code is not the problem — there exist commercial support options. On desktop FOSS often has inferior usability for non-tech users due to different incentives for product development. If you ask anyone in the legal or accounting departments of a corporation, they will demand Microsoft (not even Google) not because it’s more expensive or has terms and conditions, but because they just can’t feel themselves productive when using alternatives. LibreOffice is not bad, but it isn’t great too.