Hi - I'm trying to determine if Bitrix will be an appropriate tool for me. I have a one person business - just me. So I don't need any internal collaboration. But I'd look a good way to integrate communication methods (email, chat, screen sharing, phone meetings) with external clients, as well as have them comment on things I post for them (eg screen shots). I haven't found a way to set up users in Bitrix this way - that is, it seems internal users have access to everything - not what I want. Is there a concept of an external user one can communicate with but not share information like time tracking, detailed task planning, etc?