How to Detect Who Modified Mailbox Permissions in Exchange Online and how to protect sensitive mailbox content and prevent data leakage, organizations need to continuously monitor mailbox permission changes and be able to quickly determine what permissions were modified and by whom.
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How to check who accessed a shared mailbox
How to monitor who accessed a shared mailbox on MS Exchange 2013 – it is highly recommended that Administrator regularly monitor non-owner access to shared mailboxes.
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