Office 365 – Change Free/Busy Status On A Shared Calendar

So by default when you create a shared mailbox within 365 the permissions for authenticated users by default is to be able to view the Free/Busy time. Now this normally causes issues as people want to see a few more details so they can see who has booked the room or what for.

So to change default permissions on Outlook 365 room calendar to remove free/busy time do the following:

Connect your Powershell through to 365

PS C:\windows\system32> $session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri "https://outlook.office365.com/powershell-liveid/" -Credential $cred -Authentication Basic -AllowRedirection
 PS C:\windows\system32> Import-PSSession $session

Get the current permission list for the calendar you want to edit. We can see here that anonymous (unauthenticated) users cannot see anything whereas the “Default” (authenticated domain users) can see “AvailabilityOnly”

PS C:\windows\system32> get-mailboxfolderpermission -identity SharedMailbox@YourDomain.com:\calendar

FolderName           User                 AccessRights
----------           ----                 ------------
Calendar             Default              {AvailabilityOnly}
Calendar             Anonymous            {None}

So lets change it from the Default user being able to see just availability…

PS C:\windows\system32> set-mailboxfolderpermission -identity SharedMailbox@YourDomain.com:\calendar -user Default -AccessRights LimitedDetails

And check the new permission has set correctly again…

PS C:\windows\system32> get-mailboxfolderpermission -identity SharedMailbox@YourDomain.com:\calendar

FolderName           User                 AccessRights
----------           ----                 ------------
Calendar             Default              {LimitedDetails}
Calendar             Anonymous            {None}

Now all end users authenticated on your network can see the subject and location (if equipment).


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