Currently, our company mainly communicates using email. But as projects get more complicated, email is getting a bit of a burden, so we started looking for alternatives. Now you guys have probably tried them all, so I ask you:
We are looking for a communication system that
- is persistent. That is, we want to be able to have a complete backlog of older messages that is available to everyone.
- is personal. We want have directed communication between sets of people. It should still be accessible for the rest of the team if need be, but we don't want to spam every message to everyone.
- is secure. We want to use it for discussing things about our company, so the information should not be available to the public.
- ties into email, if possible. It would be great if we could leverage existing infrastructure and knowledge. If this is not possible, adoption might get more difficult.
To me, this sounds somewhat like a mailing list (not 2), or a forum (not 2 or 4) or Google Wave (not 3 and not available). We would be fine with a commercial system if it is not too expensive.
Do you know any collaboration/communication software/service that we could use here?