best way to add a terminated users hybrid 365 mailbox as second account in outlook

user which has left
i need to disable the user in Ad
Then add the mailbox into the users managers outlook
i thought this used to be possible?
But now it appears it cant be done if the leaving users Ad account is disabled?
How can i mange this?
If i convert to a shared mailbox and remove the license im assuming i can no longer use litigation hold?
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dougdogAsked:
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Vasil Michev (MVP)Commented:
Simply grant Full Access permissions on the mailbox, then you can add it as secondary account in the manager's Outlook profile (using the manager credentials). Dont use automapping though.
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timgreen7077Exchange EngineerCommented:
you can still give the manage full access permissions to the mailbox but the termed users mailbox and the managers mailbox both need to be on-prem or both will need to be in O365. Unfortunately one can't be on-prem and one in O365. when you disable the termed user, disable the user object in AD so that the mailbox doesn't disconnect. if you disable the object in Exchange the mailbox will disconnect from the user object.

A shared mailbox in office 365 is: Free and do not require a license, but every user that accesses the Shared Mailbox must be assigned an Office 365 license
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dougdogAuthor Commented:
when the terminated users ad account was disabled i could not add it as a second mailbox to the manager
but when i enable the account i could
also can a shared mailbox use litigation hold
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Vasil Michev (MVP)Commented:
Full access permissions are supported cross-premises, so you should have no problem whether both mailboxes are in the same location or not. And having the account disabled doesnt make a difference, because you will be accessing it via the manager's credentials (whose account is enabled).

For a shared mailbox to use hold, you have to license it. Which defeats the purpose of having a shared mailbox.
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timgreen7077Exchange EngineerCommented:
I have tried multiple times with cross premises access and it has never worked. I know that MS site mentions its supported but I don't think its fully implemented yet. Have you actually attempted this and got it working, because just 2 weeks ago i tried again with no success. I was attempting to user automapping though, and I didn't attempt it without using automapping.
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Vasil Michev (MVP)Commented:
Yes, they are supported and working, have been for months now. Automapping has never been supported, so that's your issue most likely. What they are rolling out now is support for Send on behalf of and folder-level permissions should follow soon.
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timgreen7077Exchange EngineerCommented:
Good to know. I will try it without waiting for auto mapping. Thanks
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