Delegation of mailboxes in hybrid exchange

[neonetman]

We have a number of users with access to delegated mailboxes (mainly our main office staff who have their own mailbox as well as access to the shared account).

 

Since we've migrated one of these users to Office 365, she has lost access to the the shared on premises mailbox (both through Outlook and OWA) - the mailbox shows up, but they are unable to expand the folders. I have tried removing their permissions from the shared mailbox, however I am now unable to add them back in as they don't appear in the list of available users.

 

I'm (yet again) at a loss, as I daren't move any more mailboxes until we can resolve this issue

 

Hoping you can help

 

Cheers

[forkies]

We have a number of users with access to delegated mailboxes (mainly our main office staff who have their own mailbox as well as access to the shared account).

 

Since we've migrated one of these users to Office 365, she has lost access to the the shared on premises mailbox (both through Outlook and OWA) - the mailbox shows up, but they are unable to expand the folders. I have tried removing their permissions from the shared mailbox, however I am now unable to add them back in as they don't appear in the list of available users.

 

I'm (yet again) at a loss, as I daren't move any more mailboxes until we can resolve this issue

 

Hoping you can help

 

Cheers

 

You cannot set delegation mailbox access between hybrid environments. The shared mailbox and the user mailboxes of those that need access all need to be in the same location (either all local exchange or all O365).

[chaplic]

You cannot set delegation mailbox access between hybrid environments. The shared mailbox and the user mailboxes of those that need access all need to be in the same location (either all local exchange or all O365).

 

Almost

 

As an admin, you can set Full Mailbox Access which will work and is supported. You can also set send on behalf of and send-as

 

If still no joyLook at the AD account associated with the cloud mailbox and check the msExchRecipientDisplayType attribute. It should be AclAbleRemoteMailbox https://docs.microsoft.com/en-us/exchange/hybrid-deployment/set-up-delegated-mailbox-permissions

 

sometimes you'll actually find delegate works​ but it's not supported, so you cannot rely on it.