Follow these steps to disable or delete an Exchange remote mailbox using ADManager Plus. Launch ADManager Plus and log in with appropriate credentials. Go to the Microsoft 365 tab and select Management. Navigate to Mailbox Management under Exchange Online and choose Disable/Delete Remote Mailbox. Choose either the Disable Remote Mailbox or Remove Remote Mailbox option, depending on your intended action. Select the desired domain or OU containing the remote mailbox you want to disable or delete. Locate the remote mailbox in the list or search for it using relevant criteria. Ensure that you have selected the correct remote mailbox and click Apply. When disabling a remote mailbox, it will be disconnected from the associated user account but can be reconnected later if needed. Deleting a remote mailbox permanently removes it from the Exchange environment. ADManager Plus provides additional options and settings to customize the disabling or deletion process, such as specifying the deletion mode, setting a retention period, and managing mailbox permissions before the action is executed.