Publicly share Office 365 room calendar
A customer asked me if it was possible to have a room mailbox automatically accept meeting requests from external parties. They would also like to publish the calendar of that specific room publicly.
Accept meetings from external parties
Let’s start with the first question. By default, resource mailboxes only accept requests from internal senders. As you might guess, you can’t change this behavior through the GUI, Powershell to the rescue!
Since I didn’t know the cmdlet that would let me change this behavior, the first thing I did was look for all “Calendar cmdlets”. After connecting to the Office 365 PowerShell, I ran this command
get-command *calendar* CommandType Name Version Source ----------- ---- ------- ------ Function Get-CalendarDiagnosticAnalysis 1.0 tmp_xse1ew1u.eif Function Get-CalendarDiagnosticLog 1.0 tmp_xse1ew1u.eif Function Get-CalendarDiagnosticObjects 1.0 tmp_xse1ew1u.eif Function Get-CalendarNotification 1.0 tmp_xse1ew1u.eif Function Get-CalendarProcessing 1.0 tmp_xse1ew1u.eif Function Get-MailboxCalendarConfiguration 1.0 tmp_xse1ew1u.eif Function Get-MailboxCalendarFolder 1.0 tmp_xse1ew1u.eif Function Set-CalendarNotification 1.0 tmp_xse1ew1u.eif Function Set-CalendarProcessing 1.0 tmp_xse1ew1u.eif Function Set-MailboxCalendarConfiguration 1.0 tmp_xse1ew1u.eif Function Set-MailboxCalendarFolder 1.0 tmp_xse1ew1u.eif
Seems like there are a few cmdlets concerning calendars, good info for the second question! The Get-CalendarProcessing cmdlet looks promising, let’s try it out!
get-mailbox "test room" | Get-CalendarProcessing | fl
RunspaceId : 9f1b6e5d-09a6-40d9-9b83-8006a50d4284
AutomateProcessing : AutoUpdate
AllowConflicts : False
BookingWindowInDays : 180
MaximumDurationInMinutes : 1440
AllowRecurringMeetings : True
EnforceSchedulingHorizon : True
ScheduleOnlyDuringWorkHours : False
ConflictPercentageAllowed : 0
MaximumConflictInstances : 0
ForwardRequestsToDelegates : True
DeleteAttachments : True
DeleteComments : True
RemovePrivateProperty : True
DeleteSubject : True
AddOrganizerToSubject : True
DeleteNonCalendarItems : True
TentativePendingApproval : True
EnableResponseDetails : True
OrganizerInfo : True
ResourceDelegates : {}
RequestOutOfPolicy : {}
AllRequestOutOfPolicy : False
BookInPolicy : {}
AllBookInPolicy : True
RequestInPolicy : {}
AllRequestInPolicy : False
AddAdditionalResponse : False
AdditionalResponse :
RemoveOldMeetingMessages : True
AddNewRequestsTentatively : True
ProcessExternalMeetingMessages : False
RemoveForwardedMeetingNotifications : False
MailboxOwnerId : test room
Identity : test room
IsValid : True
ObjectState : Changed
As you can see on the highlighted line, this is exactly the property we were looking for. Let’s change it so we get the desired behavior. In the get-command output, I saw a cmdlet Set-CalendarProcessing, this seems like the right one.
Get-Mailbox "test room" | Set-CalendarProcessing -ProcessExternalMeetingMessages $true
This change will only affect new meeting requests, requests that have already been refused won’t be automatically accepted.
Publish calendar publicly
In the cmdlets we got earlier, there wasn’t really one that stood out as a “possible match” so let’s look at the attributes of the calendar itself. In essence, the calendar is just a folder inside of a mailbox object. Let’s query that folder directly.
Get-MailboxCalendarFolder [email protected]:\calendar | fl RunspaceId : Identity : test room:\calendar PublishEnabled : False PublishDateRangeFrom : ThreeMonths PublishDateRangeTo : ThreeMonths DetailLevel : AvailabilityOnly SearchableUrlEnabled : False PublishedCalendarUrl : PublishedICalUrl : CalendarSharingOwnerSmtpAddress : CalendarSharingPermissionLevel : Null SharingLevelOfDetails : None SharingPermissionFlags : None SharingOwnerRemoteFolderId : AAA= IsValid : True ObjectState : Changed
That’s everything we need and more! As you can see, we can set the PublishEnabled attribute to true but we can do so much more. You can choose the detail level and even set how far back and forth the published calendar needs to go.
Let’s publish the calendar and run the Get-MailboxCalendarFolder cmdlet again to get the URL.
Set-MailboxCalendarFolder [email protected]:\calendar -PublishEnabled $true Get-MailboxCalendarFolder [email protected]:\calendar | fl RunspaceId : Identity : test room:\calendar PublishEnabled : True PublishDateRangeFrom : ThreeMonths PublishDateRangeTo : ThreeMonths DetailLevel : FullDetails SearchableUrlEnabled : False PublishedCalendarUrl : http://outlook.office365.com/owa/calendar/[email protected]/xyz/calendar.html PublishedICalUrl : http://outlook.office365.com/owa/calendar/[email protected]/xyz/calendar.ics ExtendedFolderFlags : ExchangePublishedCalendar CalendarSharingOwnerSmtpAddress : CalendarSharingPermissionLevel : Null SharingLevelOfDetails : None SharingPermissionFlags : None SharingOwnerRemoteFolderId : AAA= IsValid : True ObjectState : Changed
All done! Now you can browse to the URL and verify everything is being displayed as you’d expect.
