tell date a user was given full mailbox access to

how can i tell what date user a was given full access to user b
office 365 hybrid / exchange 2013
LVL 1
dougdogAsked:
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Annie RoseTech LeadCommented:
User History, Statistics and Activity Reports in the Office 365:
http://expert-advice.org/office365/user-login-history-statistics-activity-reports-office-365/
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