This article provides step-by-step guidance on configuring your Spacemail calendar in Outlook using the CalDAV protocol.
Since Outlook does not support CalDAV natively, you'll need to use a free third-party add-in called Caldavsynchronizer to complete the setup.
Please note that Caldavsynchronizer is not compatible with the New Outlook.
To set it up, follow these steps:
Click Download and select the version that matches your system architecture.
Run the installer and follow the on-screen instructions to complete the setup.
Once installed, open Outlook. A new tab called CalDav Synchronizer will appear on the ribbon.
Note: You need to have Microsoft Outlook 2013 or a newer version.
Click the CalDav Synchronizer tab in Outlook, then select Synchronization Profiles:

Click Add new profile:

In the list of available profile types, choose Generic CalDAV/CardDAV:

Enter the required CalDAV calendar details:
Name: Enter a recognisable name for this profile.
Outlook Folder: Select or create the calendar folder in Outlook where events should appear.
DAV URL: https://caldav.spacemail.com/
Username: Your full Spacemail email address (e.g., info@example.com)
Password: The password for this email account
Email address: Your full Spacemail email address (e.g., info@example.com)
Set the synchronisation options:
Synchronization mode: Two-way sync ( recommended)
Synchronization interval: Choose a preferred interval (e.g., every 15 minutes)

Next, click on "Test or Discover Settings." You will see the following window:

Click OK to save the profile:

Your CalDAV calendar is now successfully connected to Outlook and will sync both ways!