Thanks moedersmooiste, Mattermost PM here. Would be curious to hear more about your LDAP issues. We have many organizations who have deployed with LDAP, including with group sync to teams and channels.

Those eligible for a nonprofit license can also get the benefits of E10 offering (including LDAP) with special pricing https://mattermost.com/nonprofit/

What do you mean by LDAP issues? You don't get ldap with a free license, but there are still ways to get ldap auth despite that. (For instance, https://medium.com/p/mattermost-teams-edition-replacing-gitl...)