Which messenger to choose for the company?

Question

Active Directory

Criteria:
1. Absence of periodic payment for a subscription of each user. I would like to pay no more than $100 per year for 50-60 users.
2. Integration with Azure AD. Slack has it in one of its paid subscriptions. Needed to authorize users in our domain.
3. Clients for Windows, iOS, Android.
4. Work without access to our infrastructure, except for Azure AD.
5. It is desirable, but not necessary, to be able to store chat history with us.
6. It is desirable, but not necessary, to be able to make audio calls and audio conferences.
Thank you.

Answer 1

Telegram