---
title: Configure linked and conflict calendars in Infinity3
description: "Choose where appointments sync and which external commitments should block booking slots. #### Before you start Connect your external calendar account. Decide which calendar should receive bookings and which calendars contain commitments that affect availability. #### Understand the options -…"
url: "https://www.infinity3.co.uk/help/configure-linked-and-conflict-calendars-in-infinity3/"
updated: "2026-10-08"
category: "Infinity3 Platform / Calendars & Appointments"
---

# Configure linked and conflict calendars in Infinity3

Choose where appointments sync and which external commitments should block booking slots.

#### Before you start

Connect your external calendar account. Decide which calendar should receive bookings and which calendars contain commitments that affect availability.

#### Understand the options

- **Connected account:** Authorises access to your external calendar service.
- **Linked calendar:** Controls the selected calendar’s supported event synchronisation.
- **Conflict calendars:** Use relevant busy events to block overlapping booking slots.

#### Review your configuration

1. Open **Calendar Settings** → **Connections** and the relevant user’s calendar configuration.
2. Edit **Linked Calendar**, sometimes labelled **Primary Calendar**.
3. Select the intended calendar and review the available sync settings.
4. Enable appointment write-back where needed and supported.
5. Edit **Conflict Calendars** and select the calendars that should block availability.
6. Save and test the booking page.

Use one intended calendar for booking write-back to keep the destination clear.

#### Test blocking

Add a busy event to a selected conflict calendar. Check that the overlapping time is unavailable for the relevant user, then remove the test event.

#### Things to know

- Calendar behaviour depends on the booking calendar type and user assignment.
- Selecting a calendar does not replace working hours or other booking restrictions.
- Event Calendars use different availability rules and do not use these conflict-calendar checks.
- Keep unrelated personal details out of customer-facing appointment information.

If the result differs from your setup, contact Infinity3 with the user, booking calendar and selected external calendars.