Forum Discussion
Shared Mailbox between 2 tenants
I have 2 Office365 tenants. I need to setup shared mailboxes and calendars between the 2 groups. How can I do this? Is it possible. One tenant has an Azure Domain Controller. The other does not.
You need to define the problem a little better. What do you mean by sharing mailboxes between two tenants? Would forwarding email sent to a shared mailbox in tenant 1 to the shared mailbox in tenant 2 do the trick?
You can publish availability information for calendars so that people outside the tenant can see calendar slots. Is that sufficient?
I have users in 2 different office 365 tenants. Those users need to share a calendar.
john@tenant1.com and joan@tenant2.com.
When I setup a shared email box. I can only share that email with the users in that tenant. I can not add users from another tenant.
Each tenant is on a separate domain.
You cannot assign permissions to a shared mailbox to an account outside the tenant. One solution is to use Exchange's mailbox forwarding commands to make sure that any message sent to mailbox1 in tenant1 goes to mailbox2 in tenant2 as well (and vice versa).
You can use Set-Mailbox -ForwardingSmtpAddress to define a forwarding address in another tenant. And Set-Mailbox -DeliverToMailboxAndForward $True to make sure that a copy of any received message is kept in the target mailbox and forwarded to the mailbox in the other tenant.
