Ways to Grant Access to User's Calendar
Hello.  Here is the situation.  A user gets a meeting invite from himself for a meeting he did not create.  He looks at his calendar and he sees the meeting, but claims he did not create it.  We have looked at his calendar permissions in Outlook and besides a couple of reviewers there are no users assigned as Authors.  We have also looked at the Exchange 2010 EMC and no one has Full Access to his mailbox.  Unfortunately we don't have administrator audit logging turned on, so I can't track if someone gave themselves access and then removed it.  Am I missing any other ways for someone to gain access to another user's calendar?  Thank you!
July 13th, 2015 4:07pm

Admin Audit is turned on by default with 90 days log settings...

Get-AdminAuditLogConfig | Select AdminAuditLogEnabled, AdminAuditLogAgeLimit

To search who ran the Add-MailboxPermission cmdlet....

Search-AdminAuditLog -Cmdlets Add-MailboxPermission

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July 13th, 2015 4:49pm

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