Problem removing users from Shared Mailbox

Question

So far adding and removing users to/from mailboxes have been successful.

I removed a number of users from a shared mailbox today, and after opening the mailbox settings again, they had reappeared.

I've tried removing them individually with the same results.

No error messages and no warnings.

This is from the online exchange console. I am a global admin.

Any ideas?

Answer 1

Hi Dave,

May I know which kind of environment you have set up. Is it ADFS/DirSync or Hybrid deployment? Please provide us with the detailed information about this.

Moreover, using theRemove-MailboxPermission cmdlet to remove permissions from the shared mailbox to check this issue.

To do this, follow these steps:

Connect to Exchange Online by using remote PowerShell: Connect to Exchange Online Using Remote PowerShell

Remove full access permissions for the user from the mailbox.

Remove-MailboxPermission -Identity <Mailbox ID1> -User <Mailbox ID2> -AccessRights FullAccess -InheritanceType All

For your reference: Remove-MailboxPermission

Best regards,

Shyamal

Answer 2

This worked.

Thanks for such a swift response.

Dave

Answer 3

Actually I've just noticed;

The users I am trying to remove are all users who have left the company.

Their mailboxes have all been converted to 'shared' and need to remain in the system.

Some have onsite ad accounts (which have been disabled) and some have user accounts in the cloud with no license assigned.

Now they have been converted, are we safe to delete the user objects?

This would hopefully remove the entries from the distributions groups (one would hope)