Your meeting rooms join Outlook’s Room Finder, and every booking made there still goes through your hours, buffers and approvals. Your IT team connects your own Microsoft 365 in about an hour, and the app itself can only reach room calendars.
Microsoft 365 with Exchange Online · Outlook on desktop, web and phone · no add-in to install
In Outlook · the meeting
Budget review
Fri 24 Jul · 10:00–11:00
WithSJSarah JTRTom R
The Snug
Awaiting reply✓ Accepted
Join Teams meeting
Quick sync
Fri 24 Jul · 09:00–09:30
WithPKPriya K
Meeting Room 2
✓ AcceptedDeclined
“The minimum booking length for this room is 2 hours.”
A minute or two
In SuiteSetter · a minute or two later
Checking every rule
Booking confirmed
MRB-2026-000521
Booked in Outlook
The Snug · The Hive, Nottingham
Fri 24 Jul · 10:00–11:00 · Sarah J
✓ Opening hours✓ Buffer time✓ No clash✓ Allowed to book
On the calendar and the day sheet, owned by the organiser
Not booked
Meeting Room 2 · Fri 09:00–09:30
✓ Opening hours✓ No clash✕ Minimum 2 hours✓ Allowed to book
Declined in Outlook with the reason. No phone call needed.
How it works
One diary. Two ways in.
Outlook and SuiteSetter check in with each other every minute, in both directions. Nobody has to keep two calendars in step.
Outlook → SuiteSetter
Book it in Outlook
Add a room to any meeting. Within a minute or two it’s a SuiteSetter booking, checked against your hours, buffers, minimum lengths and approvals like any other. If it can’t stand, the room declines in Outlook with the reason.
Q3 planningFri 24 Jul
14:02
Invite sent from OutlookSarah J adds The Boardroom
14:02
Room acceptsFree, and inside opening hours
14:03
✓ Booked in SuiteSetterBuffers, length and approvals checked
SuiteSetter → Outlook
Book it in SuiteSetter
Bookings made on your SuiteSetter site show the room busy in Outlook within about a minute. Moves, cancellations, recurring series and blackouts go across too, so Outlook turns those times away itself.
Room availability in OutlookFri 24 Jul
0911131517
The Boardroom
New
Meeting Room 2
The Snug
BusyJust booked in SuiteSetterBlackout
Room Finder
Find it by building
Rooms appear in Outlook’s Room Finder by building and city, with how many they seat. SuiteSetter writes the Exchange settings for every room, so IT just runs them.
Find a room14:00–15:00
Nottingham ▾The Hive ▾Seats 4+
The BoardroomThe Hive · seats 12
Available
Meeting Room 2The Hive · seats 6
Available
The SnugThe Hive · seats 4
Busy
Booked in Outlook, then moved or cancelled there? SuiteSetter follows.
Recurring meetings come across one occurrence at a time
Rooms that need approval arrive as pending
Meetings made in Outlook are edited in Outlook, so there’s one place to change them
New rooms can take a day or two to appear in Room Finder. You can book them by name straight away.
Who books from Outlook
Your team stays where it works
You decide whose Outlook bookings count: your own staff only, or everyone in your Microsoft 365.
Serviced offices · business centres · coworking
For workspace operators
Your own team books meeting rooms from Outlook, straight into the same diary your clients book from. Clients from other companies keep booking on your branded SuiteSetter site.
Staff meetings from Outlook land in the diary at no charge
Someone without an account books in Outlook? Hold the room or decline it, your choice
Clients keep their personal calendar feed for Outlook, Google or Apple Calendar
SuiteSetter asks for as little of your Microsoft 365 as it can. Here’s exactly what it gets, and how you can check.
One application permission
The app registration asks for one thing at the application level: permission to list your rooms and where they are. No mail, no files, no people.
Place.Read.All
Scoped to room mailboxes
Calendar access comes from Exchange’s own RBAC for Applications, with a management scope that matches room mailboxes only. Staff mailboxes sit outside it.
RoomMailbox only
Proved at setup
The connection test won’t mark the integration connected until it has tried to open a real staff mailbox you choose, and failed. Run it again whenever you like.
Your tenant, your install
Your own SuiteSetter installation, with its own database, talks to Microsoft directly. No shared database, no middleman service, and sign-in tokens are stored encrypted.
Test connectionLast run 14:05
Access tokenPass
Rooms listPass
Room calendar: The BoardroomPass
Staff mailbox stays privateAccess refused, as it should be
Pass
Connected only when every line passes. The last line has to fail to read, or setup stops.
Sign in with Microsoft and calendar linking are optional, and off until your admin turns them on. A person’s own calendar is only used if they choose to link it. They use delegated permissions (User.Read, Calendars.ReadWrite, offline_access), which act on behalf of the person who signed in, never as the app.
What you need
A short list
If your organisation already runs Microsoft 365 with Exchange Online, you have almost everything. The rest is an hour of your IT team’s time and a little patience with Microsoft.
Microsoft 365 with Exchange Online
Business Standard or Premium, E3, E5 or similar. Room mailboxes don’t need a licence.
Your current plan
A Global admin and an Exchange admin
For the app registration, admin consent and a few lines of PowerShell. Often the same person.
About 1 hour
Exchange applies the permissions
Microsoft’s own delay while the room-only scope takes effect. Nothing to do but wait.
30 min to 2 hours
Rooms reach Room Finder
New rooms and building room lists show up in Outlook’s Room Finder. Booking by name works before then.
24 to 48 hours
Teams links need a Microsoft Teams licence; everything else works without one. On-premises Exchange and personal Outlook.com accounts aren’t supported.
What IT does
Six steps, about an hour.
Mostly copy and paste. SuiteSetter writes each room’s PowerShell from its own rules and fills in your IDs. The IT setup guide walks through the same six steps.
Every bookable room is a room mailbox, with its building and city so Room Finder can list it.
2
Register the app in Entra
Single tenant, one application permission to list rooms, then grant admin consent.
3
Limit it to room mailboxes
Three lines of Exchange PowerShell give the app calendar access for room mailboxes only.
4
Connect SuiteSetter
Paste the IDs and secret into Settings → Integrations and run the test. It proves a staff mailbox is out of reach.
5
Map rooms, mirror rules
Pair each room, then run the lines SuiteSetter writes for it: hours, rules, Room Finder details and a room list per building.
6
Test both ways
Book, move and cancel from each side. From then on the sync runs every minute.
IT questions, answered
Can clients from other companies book from their own Outlook?+
No. SuiteSetter connects to your organisation’s own Microsoft 365, and bookings from other Microsoft 365 organisations aren’t supported. Clients from other companies keep booking on your SuiteSetter site, and can subscribe to their bookings in Outlook, Google or Apple Calendar.
Does it work in Outlook on desktop, web and mobile?+
Yes. SuiteSetter works through Exchange Online itself, not an add-in, so any Outlook that can add a room to a meeting works the same way: the desktop apps, Outlook on the web and Outlook on your phone. There’s nothing to install on anyone’s computer.
Do we need Microsoft Teams?+
Only for Teams links. Rooms sync both ways without it. Meetings booked in Outlook keep their Teams links, and SuiteSetter shows them on the booking. To add a Teams link when booking in SuiteSetter, a person needs a Teams licence and links their Microsoft account once, then ticks “Add a Microsoft Teams meeting” on the SuiteSetter booking form. That box appears once your admin turns on calendar linking, for single bookings in rooms connected to Outlook. It isn’t offered for recurring series.
Can SuiteSetter read our email or staff calendars?+
No mail, ever. Calendars: only room calendars, plus the calendar of anyone who chooses to link theirs, which stays off until your admin turns it on. The app’s only application permission is Place.Read.All, and Exchange limits its calendar access to room mailboxes. The connection test won’t finish until it has proved it can’t open a real staff mailbox, and you can run it again whenever you like.
What happens if an Outlook booking breaks a rule?+
Exchange turns away clashes and closed times as soon as you send. SuiteSetter checks everything else, such as buffers, minimum lengths and booking steps, within a minute or two. If the booking can’t stand, the room declines in Outlook with the reason, so the organiser may see it accept first and then decline. Rooms that need approval arrive as pending.
Who can book from Outlook?+
You choose: your own staff only, or everyone in your Microsoft 365. It starts at staff only for workspace operators and everyone for company offices. Outlook bookings from anyone else can either hold the room or be declined, and that’s your choice too.
Bring your rooms into Outlook
Tell us about your rooms and your Microsoft 365. We’ll show you the whole loop and come back with demo dates, usually within a day.