Outlook booking link and Microsoft 365 calendar sync: Caletus + Outlook Calendar
Share an Outlook booking link that checks your Microsoft 365, Exchange Online or Outlook.com calendar in real time, so you never get double-booked.
What Caletus does with Outlook Calendar.
- Picks up calendar changes fast with Microsoft Graph delta queries
- Creates the event and sends calendar invites to attendees
- Checks shared Exchange mailboxes for conflicts too
- Converts time zones for people booking from anywhere
How to connect Outlook Calendar to Caletus.
- A Microsoft 365 work or school account, or a personal Outlook account.
- Approval from your Microsoft 365 admin, if your company's Microsoft Entra ID (formerly Azure AD) policy requires it.
- 1
Open Integrations
Go to Settings > Integrations and select 'Microsoft Outlook'. - 2
Sign in with Microsoft
Use your work or personal Microsoft account on Microsoft's secure sign-in page. - 3
Set your sync rules
Pick the Exchange calendar that gets new bookings, and set buffer time between meetings.
What Caletus can see in your Outlook Calendar
Your Outlook connection and sign-in tokens are encrypted. Caletus connects through the Microsoft Graph REST API over TLS 1.3, and stores access tokens encrypted at rest with AES-256.- Calendars.ReadWrite (create meetings and update meeting invites)
- Calendars.Read (see busy and free times on the calendars you pick for conflict checks)
Outlook Calendar limits and quick fixes.
- Older on-premises Exchange Server (before 2016) without hybrid Modern Authentication isn't supported.
- Companies with strict Microsoft Entra ID (Azure AD) settings may need their Microsoft 365 admin to approve Caletus.
- If your organization restricts third-party apps, ask your Microsoft 365 tenant admin to approve the Caletus enterprise application in Microsoft Entra ID (formerly Azure AD).
- Make sure your account has Full Access or Editor permission on the shared Exchange mailbox in Outlook Web Access.
- Caletus refreshes your Microsoft Graph tokens in the background. If a password change ends the session, click 'Reconnect' in Settings.
Outlook Calendar integration FAQs.
Common questions about using Microsoft Outlook Calendar with Caletus.
Talk it through with our teamYes. Caletus connects to Microsoft 365, Exchange Online and personal Outlook.com calendars and gives you an Outlook booking link. Once Outlook Calendar is connected, you can set your meeting types to create a new Microsoft Teams meeting link for every booking automatically.
Yes. Caletus checks your Outlook and Google calendars together for conflicts before it shows any open times, so nobody can book you when you're busy in either one. Connecting more than one calendar needs the Professional plan, which allows up to 6 calendars per person.
Set up Outlook Calendar in a few clicks.
Start free, connect your calendar, and turn on this integration in Settings when you're ready. No credit card needed.
- No credit card required
- Two-way calendar sync
- Set up in under 2 minutes