We are asking ourselves the same question. We have developed for a few years a "more than email" server that we have already licensed to one major customer. T

We are asking ourselves the same question. We have developed for a few years a "more than email" server that we have already licensed to one major customer. The open source or not question is one main right now, and until we decide, we have prepared a free to download offer based on Docker. If you're curious: https://github.com/MLstate/PEPS https://github.com/MLstate/PEPS We haven't really launched yet, but think that open sourcing (using for instance the AGPL license) might bring: - more visibility, - more confidence for the customers who would buy support and maintenance instead of licenses, - the opportunity of creating a community (if not on the core product, at least on extensions) - the loss of a few potential customers that would just use the open source version instead of work with us.