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Copper Contributor

Feb 16, 2023

Azure B2B account accessing Exchange365 Shared Mailbox

Hello, We are trying to grant access to an account that has been created via B2B Invite. This account can collaborate without issue in SharePoint and Teams. We have the ability to add this accoun...

Steel Contributor

Feb 18, 2023

Not possible to do this:
https://learn.microsoft.com/en-us/microsoft-365/admin/email/about-shared-mailboxes?view=o365-worldwide

” External users: You can't give people outside your business (such as people with a Gmail account) access to your shared mailbox.”

MikeGrove
Copper Contributor
Feb 22, 2023
I was hoping that this did not apply to a "Federated" B2B configuration between two Azure Tenants. This is being done as part of a merger of business units, and was hoping we could integrate without the need to duplicate accounts across the tenants.

If there is any other suggestions please feel free to post them.
- beaumcmahon
  Copper Contributor
  Feb 13, 2024
  MikeGrove I'm pretty sure you can do this, BUT you have to purchase at least a EOP1 license(s) and apply it to the user(s), in the tenant that has the shared mailbox. Or if there's another (cheaper) license that's available to you that provides exchange access, you could use that.
- AdzyD86
  Copper Contributor
  Mar 08, 2024
  MikeGrove
  Hey Mike
  
  Did you ever manage to get this going?
  I am too facing a similar issue.
  We have some shared mailboxes in one Azure tenant.
  B2B is configured and working for Sharepoint but now we need to share mailboxes with users in the other tenant.
  
  Thanks
  
  Adam
  - MikeGrove
    Copper Contributor
    Mar 08, 2024
    Hello AdzyD86
    
    We decided at the time to move forward with some limited duplication of accounts across the Tenants. We have not investigated if assigning Exchange licenses to the external users as mentioned above resolves the issue.
    
    Thanks
    
    MikeG

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