HI folks,
First of all, I have been evaluating mattersmost and it seems like a great communication tool! We were quite enthusiastic about it, but felt disappointed that you decided to roll LDAP support into a commercial product. I can completely understand the need to fund and promote your enterprise. I am not looking for full AD integration, but a simple LDAP based SSO would have sealed the deal for us.
Let me put in a simple business case for supporting it in the open source or community version. Most IT departments tend to be cash starved, and it take skunkwork projects from people not necessary from IT to build something. The closer the skunkworks project is to integration the better the chance of an IT department deciding to support it, and then there is a great business case to get the enterprise version.
I could not use this for the non-profit because we don't have money but we do have donated funds to have a decent infrastructure with SSO. It would have been nice for established open source project like GNOME (http://www.gnome.org/) to be able to use this while still philosophically supporting open source.