If you want to change a user mailbox in Exchange to a shared mailbox, then there is a simple powershell command that you can run within Exchange Management Shell (EMS) to carry this out.
Just open up EMS and use this command:
Set-Mailbox "user mailbox name" -Type:Shared
- “user mailbox name” – is the name of the user mailbox you want to change to a shared mailbox
Then if you go back into your Exchange Management Console, you should see that this is now a shared mailbox and you can set the permissions as required for multiple user access.
If you want to change a shared mailbox into a user mailbox, then there is a guide here to see how to do that too.
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