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Calendar Processing

This page provides a quick reference for managing calendar processing, meeting requests, and resource mailbox rules in Exchange Online using PowerShell.

📘 Connecting to Exchange Online

Connect-ExchangeOnline -UserPrincipalName [email protected]

⚙️ View Current Calendar Processing Settings

Check the configuration for a specific mailbox or resource:

Get-CalendarProcessing -Identity "MailboxName"

Common output fields include:

  • AutomateProcessing — how meeting requests are handled (AutoAccept, AutoUpdate, None)
  • AddOrganizerToSubject — whether the organizer’s name is added to the meeting subject
  • AllowConflicts — allows overlapping bookings (for shared rooms/resources)
  • BookingWindowInDays — how far in advance bookings are accepted
  • EnforceSchedulingHorizon — restricts bookings beyond the allowed window
  • AddAdditionalResponse — adds a custom response to meeting invitations

🧩 Configure Automatic Meeting Processing

Enable AutoAccept for a Mailbox

Set-CalendarProcessing -Identity "MailboxName" -AutomateProcessing AutoAccept

Disable Automatic Processing (Manual Approval Required)

Set-CalendarProcessing -Identity "MailboxName" -AutomateProcessing None

Update Organizer Information in Subject Line

Set-CalendarProcessing -Identity "MailboxName" -AddOrganizerToSubject $true -DeleteComments $false -DeleteSubject $false

🏢 Resource Mailbox Configuration (Rooms & Equipment)

Enable Automatic Booking

Set-CalendarProcessing -Identity "RoomName" -AutomateProcessing AutoAccept -AllowConflicts $false -BookingWindowInDays 180 -EnforceSchedulingHorizon $true

Allow Conflicts (e.g., Shared Spaces)

Set-CalendarProcessing -Identity "RoomName" -AllowConflicts $true

Set Custom Booking Responses

Set-CalendarProcessing -Identity "RoomName" -AddAdditionalResponse $true -AdditionalResponse "Your meeting has been auto-accepted by Fusion Reference System."

Disable Automatic Responses

Set-CalendarProcessing -Identity "RoomName" -AddAdditionalResponse $false

🧭 Check Room Mailbox Settings for All Rooms

List all resource mailboxes with auto-accept enabled:

Get-Mailbox -RecipientTypeDetails RoomMailbox | Get-CalendarProcessing | Where-Object {$_.AutomateProcessing -eq "AutoAccept"} | Select Identity, AutomateProcessing, BookingWindowInDays, AllowConflicts

🧰 Common Scenarios

1. Enforce Booking Rules for All Rooms

Get-Mailbox -RecipientTypeDetails RoomMailbox | ForEach-Object {
    Set-CalendarProcessing -Identity $_.PrimarySmtpAddress -AutomateProcessing AutoAccept -AllowConflicts $false -BookingWindowInDays 180 -EnforceSchedulingHorizon $true
}

2. Enable Custom Response on All Room Mailboxes

Get-Mailbox -RecipientTypeDetails RoomMailbox | ForEach-Object {
    Set-CalendarProcessing -Identity $_.PrimarySmtpAddress -AddAdditionalResponse $true -AdditionalResponse "Your meeting has been auto-accepted by Fusion Reference System."
}

3. Verify All Room Mailbox Configurations

Get-Mailbox -RecipientTypeDetails RoomMailbox | Get-CalendarProcessing | Select Identity, AutomateProcessing, AllowConflicts, BookingWindowInDays

📊 Quick Reference Summary

Task Command Description
View settings Get-CalendarProcessing -Identity "User" Shows calendar processing configuration
Enable AutoAccept Set-CalendarProcessing -Identity "User" -AutomateProcessing AutoAccept Automatically accepts meeting invites
Disable AutoProcessing Set-CalendarProcessing -Identity "User" -AutomateProcessing None Manual meeting handling
Enable Custom Response Set-CalendarProcessing -Identity "User" -AddAdditionalResponse $true -AdditionalResponse "Text" Sends custom confirmation messages
Configure Room Mailbox Set-CalendarProcessing -Identity "RoomName" -BookingWindowInDays 180 Restricts booking horizon

🧩 Notes

  • Use AutoAccept for shared calendars or room mailboxes that should process requests automatically.
  • Use AutoUpdate if users need to manually confirm requests after tentative acceptance.
  • Configuration changes may take several minutes to replicate across Exchange Online.

Updated: {{ date }}
Author: Tomas Toohey
Reference Category: Exchange Quick References

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