Exchange Online (Office 365) - Hide from Exchange address lists.

    Using this feature, you can hide the desired users' mailboxes from the Exchange address lists.

    Steps:

    • Click the AD Mgmt tab.
    • Select Office 365 Management in the left pane. Then click the hide from address lists link located under Mailbox Management.
    • Select the desired Office 365 account.
    • Select the desired users from the list.
    • Click the Configure link located at the right extreme.
    • In the hide from Exchange address lists field, select Yes or No, as needed.
    • Click Apply.