Microsoft 365 Sync Service v2

Written By Sam Walton (Super Administrator)

Updated at April 7th, 2026

📌 Applies to Version 2 (20231018.1) of the IBSS Microsoft 365 Sync Service

The IBSS Platform provides the IBSS Microsoft 365 Sync Service that allows users to create appointments for workspaces directly and solely in Microsoft Outlook or Teams and have these appointments synchronised as bookings with the IBSS Platform.

Use this if you want meetings within the organisation to solely be created in Outlook or Teams and synchronised with IBSS. When appointments are moved in Outlook or Teams or attendees are being added, they will get updated in IBSS.

Note: The meetings should not be changed in IBSS as this will not be reflected back in the Microsoft 365 appointment.

 

There are several consideration points about IBSS Microsoft 365 Sync Service:

  • Synchronisation period     
    The IBSS Microsoft 365 Sync Service will work within a configurable parameter called the Forward_Sync_Period which will determine how far in advance the service will look for appointments in Outlook to update IBSS correspondingly. 
    The default for the Forward_Sync_Period is 7 days. We recommend not amending this, especially for big environments.

Note: Users won't see their future bookings in IBSS that are further in the future than the Forward_Sync_Period that is set up for your organisation.

Note: The Outlook meeting description is not synchronised to IBSS and correspondingly won't update in IBSS if changed in Outlook.

  • Per building configuration     
    The IBSS Microsoft 365 Sync Service is configured for each building separately, and buildings can have different forward sync periods.

Note: Users might not know the forward sync periods for their building.

  • IBSS Microsoft 365 Sync Service and booking policies     
    IBSS Microsoft 365 Sync Service disregards any booking policy defined in IBSS.
  • Adding additional services     
    Additional services such as catering, equipment, or hearing or presentation aids cannot be used directly when creating a booking in Outlook or Teams.
  • Syncing with the certain space type
    Sync Service will synchronise IBSS system with spaces that are connected to Outlook as well as another external booking system that might be in use.
  • AAD migration and domain change
    If an organisation is going through an AAD migration and changed the domain while using the Sync Service, they could experience a problem with bookings being constantly amended and corresponding notifications sent with each change. The recommendation is to ensure that the users are migrated and invited from the single Azure tenant so there is no mismatch.

✅ Supported scenarios for IBSS Microsoft 365 Sync Service

Scenario
Action
Create appointment in Outlook or Teams and invite a room
Booking gets created in IBSS for that space and linked to the Microsoft 365 appointment
Update appointment in Outlook or Teams
Booking gets updated in IBSS
Move appointment in Outlook or Teams to another day in the future
Booking updated in IBSS
Delete appointment in Outlook or Teams
Booking gets cancelled in IBSS
IBSS auto cancels the booking if not checked in Booking is removed in the resource calendar for other people to use it. User's calendar is not modified.
Check out of the meeting earlier than its end time Appointment in the resource calendar is shrunk to the checkout time. User's calendar is not modified.

❌ NOT supported scenarios for IBSS Microsoft 365 Sync Service

Scenario Action
Manage booking that require approvals Not supported. Bookings that are approved in IBSS do not reflect the same status in Outlook.
Update booking in IBSS linked to the Outlook or Teams appointment
Does not happen
Move booking in IBSS linked to an appointment to another day within forward sync period
Does not happen, is not allowed
Delete booking in IBSS
Is not allowed     
Outlook returns the event back even if you have more rights and managed to delete a booking in IBSS
Add catering or other services to an existing booking in IBSS Is not allowed