---
title: Connect your Microsoft 365 calendar to Infinity3
description: "Connect your cloud-based Microsoft calendar to support appointment sync and availability checks. #### Before you start You’ll need your Microsoft login, access to Infinity3 calendar settings and the necessary calendar permissions. Events stored only in desktop Outlook or on an…"
url: "https://www.infinity3.co.uk/help/connect-your-microsoft-365-calendar-to-infinity3/"
updated: "2026-10-08"
category: "Infinity3 Platform / Calendars & Appointments"
---

# Connect your Microsoft 365 calendar to Infinity3

Connect your cloud-based Microsoft calendar to support appointment sync and availability checks.

#### Before you start

You’ll need your Microsoft login, access to Infinity3 calendar settings and the necessary calendar permissions. Events stored only in desktop Outlook or on an on-premises Exchange server are not supported by this connection.

#### Connect Microsoft

1. Log into app.infinity3.ai using your own Infinity3 profile.
2. Open **Settings** → **Calendars** → **Connections**, or **Calendars** → **Calendar Settings** → **Connections**.
3. Select **Add New** and choose **Connect** beside Outlook Calendar.
4. Sign into the intended Microsoft account.
5. Review and accept the required permissions. The connection may be identified as **LeadConnector**.
6. Return to Infinity3 and check the account is connected.

If Microsoft displays **Need admin approval**, ask your Microsoft administrator or IT provider to review the connection.

#### Configure and test

Select the linked and conflict calendars required for your setup. Writer access is needed for appointments to be sent to Microsoft.

Test both an external busy event and an Infinity3 booking to confirm the intended behaviour.

#### Things to know

- Connecting Microsoft email does not complete calendar configuration.
- Check that the events you need are visible in your cloud calendar.
- Microsoft Teams meeting-link setup is a separate connection.
- Disconnecting can affect availability and appointment sync.

If setup fails, contact Infinity3 with the user email and error. Do not share passwords or authentication codes.