Sometimes, for several reasons, you’ll have to import calendar events into users mailbox in O365.

That could be done using different methods, directly using a service account (with a mailbox !), impersonated (as if the user created the event).

Here below is a quick example of a small script (powershell of course ! )

O365 connexion :

Import-Module MSOnline
$O365Cred = Get-Credential
$O365Session = New-PSSession –ConfigurationName Microsoft.Exchange -ConnectionUri https://ps.outlook.com/powershell -Credential $O365Cred -Authentication Basic -AllowRedirection
Import-PSSession $O365Session -AllowClobber
Connect-MsolService –Credential $O365Cred

In my case, I have to fulfill all roommailboxes calendar using a csv extrat from an old tool. Those meetings have to be created by the user, and autoaccepted by rooms.

#Locate Microsoft Exchange Webservices dll
Import-Module -Name "C:\scripts\tools\office365_license_mgmt\Office365Mgmt\Microsoft.Exchange.WebServices.dll"
$ExchangeService = New-Object Microsoft.Exchange.WebServices.Data.ExchangeService([Microsoft.Exchange.WebServices.Data.ExchangeVersion]::Exchange2013)
$creds = New-Object System.Net.NetworkCredential($O365Cred.UserName.ToString(),$O365Cred.GetNetworkCredential().password.ToString()) 
$ExchangeService.Credentials = $creds
#Enable impersonation to book into the user's calendar
$ExchangeService.ImpersonatedUserId = New-Object Microsoft.Exchange.WebServices.Data.ImpersonatedUserId([Microsoft.Exchange.WebServices.Data.ConnectingIdType]::SmtpAddress,$MeetingAuthor)
$ExchangeService.AutodiscoverUrl("$MeetingAuthor", {$true})

 

Then you’ll have to create your event, based on your import file:

#Formating Event
$appointment = New-Object Microsoft.Exchange.WebServices.Data.Appointment -ArgumentList $ExchangeService
$appointment.Subject = "$SubjectM"
$appointment.Location="$RoomName"
$appointment.Body = $Body
$appointment.Id.UniqueId
    #$appointment.RequiredAttendees.Add("$($MeetingAuthor)")
$appointment.RequiredAttendees.Add("$($RoomMail)")
$Appointment.ReminderMinutesBeforeStart=60
$appointment.Start = Get-Date "$startdate" -Hour $StartTimeHour -Minute $StartTimeMinute
$appointment.End = Get-Date "$EndDate" -Hour $EndTimeHour -Minute $EndTimeMinute
$appointment.IsAllDayEvent = $false
$appointment.LegacyFreeBusyStatus = [Microsoft.Exchange.WebServices.Data.LegacyFreeBusyStatus]::Busy
$appointment.IsReminderSet = $false

And finally, just save it !

$appointment.Save([Microsoft.Exchange.WebServices.Data.SendInvitationsMode]::SendOnlyToAll) | out-null

And, of course, close that pssession at the end !

#Closing remote Session to O365
Get-Pssession | Remove-Pssession