Outlook Integration with multiple Microsoft 365 tenants

[newbie1]

Hello

We are evaluating a self-hosted EspoCRM setup in which users from several independent Microsoft 365 and Microsoft Entra tenants would work in the same EspoCRM instance.

Can one EspoCRM instance using the Outlook Integration connect personal mailboxes, shared mailboxes, calendars and contacts from multiple Microsoft 365 tenants?

If this is supported:

1. Should a single multi-tenant Microsoft Entra application be used?
2. Can administrator consent be granted separately in each Microsoft 365 tenant?
3. Can users from each tenant connect their individual Outlook accounts?
4. Are shared mailboxes and group email accounts supported across the different tenants?
5. Are there any limitations affecting email, calendar or contact synchronisation?

If this is not supported, is there another recommended configuration, or would a separate EspoCRM instance be required for each Microsoft 365 tenant?

We would appreciate confirmation from an EspoCRM team member, as this question affects the deployment architecture.

Thank you.

[victor]

Can one EspoCRM instance using the Outlook Integration connect personal mailboxes, shared mailboxes, calendars and contacts from multiple Microsoft 365 tenants?

From Administration > Integrations > Outlook > Tenant > info:

Controls who can sign into the application.

• common – Allows users with both personal Microsoft accounts and work/school accounts from Azure AD to sign into the application.
• organizations – Allows only users with work/school accounts from Azure AD to sign into the application.
• consumers – Allows only users with personal Microsoft accounts (MSA) to sign into the application.

Note: If your Azure application is not set as multi-tenant, common value will cause an authentication error. You need to use an appropriate value.

1. Yes, a multi-tenant Entra application can be used.
2. Yes, each Microsoft 365 tenant can authorize the application separately.
3. Yes, users from different tenants can connect their own Outlook accounts via OAuth. An important detail is that each user who wants to connect must have an active license from Microsoft. Without it, there will be no connection. More about how to connect Shared Mailboxes: https://forum.espocrm.com/forum/exte...tion-extension.
4. Yes, Group Email Accounts are supported, but each tenant's mailbox must be configured/authorized separately.
5. Yes. There are limitations, particularly around recurring calendar events, some synchronization behavior, and Contacts being primarily a Pushing to Outlook function. If you read the documentation, you will understand the limits for Calendar, Emails, and Contacts in detail.