Unable to delete a shared mailbox

Question

When I try to delete a Shared Mailbox I get this error message. Selecting delete displays the same message.  

I ge the same error message in Exchange Online and when I try to delete it in Powershell.

How can I get this removed?

Answer 1

Hi Dave,

May I know whether the shared mailbox is in hybrid environment?

Which kind of environment you have set up? Is it Hybrid deployment or purely Exchange Online?

Does this issue happen to any other shared mailbox or specific to this shared mailbox?

Moreover, please try to delete shared mailbox via using different admin account to see whether the problem still occurs.

Best regards, 

Shyamal

Answer 2

Hi Shyamal,

All the mailboxes are in Office 365 but our AD is on-premise (they sync up via DirSync). I don't know if you'd class this as a hybrid? 

I've tried this from 2 Office admin accounts now with a number of shared mailboxes. Every time we get the same error message.

What are the next steps?

Thanks

Answer 3

Hi Dave ,

Thanks for your reply . For further assistance , I need to collect some information .

1 . Do you use on-premise Exchange servers ?

2 . How did you create the shared mailbox ? Did you create it in cloud or create a user mailbox on-permise and then migrate it to cloud and convert it to shared mailbox ?

3 . Use Get-Mailbox cmdlet to get the information of the shared mailbox . You can post the result via private message .

4 . Does this happen to all the shared mailboxes ?

5 . When Dirsync works , is there any error message in MIISClient ?

To protect your privacy, I have sent you a private message to collect them. Please click on the link below to access your Private Message : https://answers.microsoft.com/en-us/privatemessage/inbox

Best regards ,

Rick

Answer 4

Hi Rick,

Details have been sent over in the message as requested.

Thanks

Answer 5

Hi Dave,

Thanks for your updates in the private messages.

For my understanding, since you had on-premise Exchange servers ago and didn’t have it later, the shared mailbox may be related to the attributes in the AD. Given the situation, I’d like to collect the following information:

1. About “I've tried this from 2 Office admin accounts now with a number of shared mailboxes. Every time we get the same error message.”, were these shared mailboxes created ago or some shared mailboxes are created online directly?
2. If they are all old shared mailboxes, can you create a new shared mailbox online directly and delete them successfully?
3. Please run the following PowerShell and provide the results in the private message.

(1)   Open Window PowerShell on your DC.

(2)   PS C:\Users\Administrator> Get-ADUser -Filter {(UserPrincipalName -eq "******@contoso.com")}

Note:  You need to change the local_shared_mailbox1 to your shared mailbox’s email address.

4. Meantime, I check the PowerShell results for the shared mailbox you provided in the private message. I think it is not full one. Can you re-run the following command?

Get-Mailbox –identify ******@contoso.com | fl

5. About the MIISClinet, you can go to the server that installs the AAD Connect and go to the following path:

C:\Program Files\Microsoft Azure AD Sync\UIShell

If you use the DirSync, you may need to go to another path:   <Drive>\Program Files\Microsoft Online Directory Sync\SYNCBUS\Synchronization Service\UIShell

I have sent you a private message to collect them.

Best Regards,

Erick