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The Customer Service Center's Specialists and student Representatives have been granted view-only rights to pretty much everything in Office 365 in regards to Exchange Online.
Staff will
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need to visit https://outlook.office.com/ecp
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and sign
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in with their O365 credentials.
From there,
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the key highlights are:
Recipients
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Just like the on-prem version of Exchange, you can look up users
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under "Mailboxes", room and equipment mailboxes
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under "Resources", and shared mailboxes under....well,
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"Shared". 
Perform a search for a user and double-click the name to open the result.
Go to Mailbox Delegation and you'll see who
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has Full Access
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to the mailbox, who
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has Send As
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rights, etc. You can see the mailbox usage for everything as well.
Still
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within Recipients, there's also
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a Groups
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tab, which is all mail-enabled groups... whether they
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are Distribution Lists
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or Security Groups.
Any group that has an address will be in there, and you can see who the owners and members are, what email addresses are assigned to the group, etc.
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What the "Mailboxes" tab should look like (with names and email addresses blocked out for privacy).
Protection
Under "Action Center" you can see if
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any compromised accounts
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are currently
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being blocked
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by Microsoft for sending email out.
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This feature is not heavily used, but you do see tickets for it every once in a while.
Editor's Note: Apparently there's now a 'new and improved Restricted Users page in the Security & Compliance center'. Should probably follow up with Messaging about that.
Mail Flow
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Under Message Trace,
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you can track every email in the past seven days that has gone in or out of anybody's mailbox.
This
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will NOT tell you if Cisco quarantined a message coming in from some external source, but
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this will
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tell you if messages were delivered, what folder they went
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to (typically including the reasoning why, like rules or forwarding),
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and will even tell you what IP
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Office 365 connected to for sending an
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email out
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to some external source.
Public Folders
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Clicking this link gives you a list of the Public Folders
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.
Users accessing this page should be able to click on the "Folder Permissions > Manage" link on the right side of the page when they have a
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public folder highlighted.
What the "Public Folders" tab should look like (again, with names blocked out for privacy).