User Mailbox Permissions

Andrea Cavenago 21 Reputation points

using the MS365 Exchange Admin interface I grant full permissions on a user's (A) mailbox to another user (B).
My question is simple: is user A able to find out that user B has access to his mailbox?

Thank you,

Microsoft Exchange Online Management
Microsoft Exchange Online Management
Microsoft Exchange Online: A Microsoft email and calendaring hosted service.Management: The act or process of organizing, handling, directing or controlling something.
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Accepted answer
  1. Vasil Michev 100K Reputation points MVP

    Generally speaking no, as this is admin-level operation. That said, the user might obviously notice any changes made to items within the mailbox or its configuration. And obviously there might be some legal implications.

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  1. Andrea Cavenago 21 Reputation points

    Thank you for your answer michev!
    Do you know if the mailbox will automatically pop-up in Outlook of user B or needs to be opened? Outlook is at its latest version (16.0....).

  2. Andrea Cavenago 21 Reputation points

    Thank you both!
    I used the following script because I need it to not auto-appear in Outlook:

    Add-MailboxPermission -Identity user1_mailbox -User user2_mailbox -AccessRights FullAccess -AutoMapping:$false

    Thanks again,

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