CalioConnect your Outlook calendar (Microsoft 365) to your scheduler
Working in Outlook or Microsoft 365? Connect your calendar to Calio in a few clicks. Guests can then never book a time you already have an appointment for — and every new booking shows up in your Outlook calendar automatically.
Start free and connect your calendarHow the connection works
Connect your Microsoft account
In Calio, go to Integrations and click "Connect Microsoft calendar". You sign in with your Microsoft 365 or Outlook account and grant permission once.
Your availability keeps itself right
Calio checks your free/busy times through Microsoft Graph every 5 minutes. Events in your Outlook calendar automatically block those slots.
Bookings land in your calendar
When a guest books, the appointment appears in your Outlook calendar immediately. If they cancel or reschedule, your calendar is updated automatically.
Why connect it?
Works with your existing Microsoft setup
Suitable for both business Microsoft 365 accounts and personal Outlook accounts — no plugins or add-ins.
Never double-booked
Teams meetings, internal appointments and personal blocks in Outlook block your booking link automatically.
A Teams link, automatically
Set an event type to Microsoft Teams and Calio creates a dedicated Teams meeting through your calendar for every booking. The join link appears in the confirmation email, the reminder and on your guest’s appointment page.
Privacy by design
Calio does not read the contents of your events and runs entirely on European infrastructure.
Frequently asked questions
What does Calio see of my calendar?
Only when you are busy (free/busy times), never the title, attendees or contents of your events. Connection tokens are stored encrypted (AES-256-GCM) and you can disconnect at any time. We never share your calendar data with third parties.
How fast is the sync?
Your availability is refreshed against your calendar every 5 minutes. New bookings are written to your calendar immediately, and removed or moved straight away when a guest cancels or reschedules.
Does this work with my organisation’s business Microsoft 365 account?
Yes. Depending on your organisation’s settings, an administrator may need to approve the connection once (admin consent) — you will see "Approval required" when signing in. calio.nl/en/microsoft-approval lists exactly which permissions Calio asks for and lets your admin approve Calio for the whole organisation in one click. After that, everyone connects without that screen.
Connect Microsoft 365 / Outlook in a few clicks
Free plan, booking link in 2 minutes, data in Europe.
Start free