Work area with Email/im/address book for multiple companies?

What I want:
cloud workplace for several companies or one large. email attachments-chat-address book-ads and so on.
ie a place roughly mail with additional functions, chat, address book, ability to add different domains and mail from different domains and to administer all of this. all these users need to communicate with each other in chat rooms, such as in discharge or telegram, perhaps even voice. the possibility of a separate admin to create ads that you see all... of such services is nowhere to be seen. speaking about the collaboration of the holding or coprorate would be a very convenient thing as you think?
March 23rd 20 at 19:18
1 answer
March 23rd 20 at 19:20
Look at the CRM system, such Битрикса24 or AmoCRM - they all have (and even more). Yandex is a Tracker and an entire ecosystem for it to work. Naturally, some functions are paid.

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