Outlook for Windows does not natively support CalDAV and CardDAV protocols used by Infomaniak for calendars and contacts. CalDAV Synchronizer is a free, open-source plugin that solves this problem. Here\'s how to install and configure it.
Why CalDAV Synchronizer?
Microsoft Outlook uses its own protocol (Exchange) to synchronize calendars and contacts. But Infomaniak, like most non-Microsoft hosts, uses the open standards CalDAV and CardDAV.
| Protocol | Usage | Outlook Support |
|---|---|---|
| Exchange | Microsoft 365, Exchange Server | Native |
| CalDAV | Calendars (Infomaniak, Google, Apple...) | Via plugin |
| CardDAV | Contacts (Infomaniak, Google, Apple...) | Via plugin |
CalDAV Synchronizer is the solution: a free, open-source, actively maintained plugin that adds CalDAV/CardDAV support to Outlook.
Prerequisites
- Microsoft Outlook for Windows (2010, 2013, 2016, 2019, 2021, or 365)
- An Infomaniak email account with calendar/contacts enabled
- Your Infomaniak account credentials
Note for Outlook Mac
Outlook for Mac natively supports CalDAV/CardDAV accounts. This guide is for Outlook for Windows only.
Step 1: Download CalDAV Synchronizer
- Go to caldavsynchronizer.org
- Click "Download" to get the latest version
- Choose the .msi file matching your Outlook version (32 or 64 bit)
How to check your Outlook version?
Open Outlook → File → Office Account → About Outlook. You will see "32-bit" or "64-bit" in the information.
Step 2: Install the Plugin
- Close Outlook completely before installation
- Double-click the downloaded .msi file
- Follow the installation wizard (Next → Next → Install)
- Restart Outlook
After restarting, a new "CalDAV Synchronizer" tab appears in the Outlook ribbon.
Step 3: Retrieve CalDAV/CardDAV URLs from Infomaniak
Before configuring the plugin, retrieve your synchronization URLs:
For the Calendar
- Log in to Infomaniak webmail
- Go to the Calendar section
- Click the three dots next to the desired calendar
- Select "Share" or "CalDAV link"
- Copy the CalDAV URL (format: https://caldav.infomaniak.com/...)
For Contacts
- In webmail, go to the Contacts section
- Address book settings
- Copy the CardDAV URL (format: https://carddav.infomaniak.com/...)
Default Infomaniak URLs
If you can\'t find the URLs, try:
- CalDAV: https://caldav.infomaniak.com/calendars/YOUR_EMAIL/
- CardDAV: https://carddav.infomaniak.com/addressbooks/YOUR_EMAIL/
Step 4: Configure Calendar Synchronization
Open CalDAV Synchronizer
In Outlook, click the "CalDAV Synchronizer" tab → "Synchronization Profiles"
Create a new profile
Click the "+" button (Add new profile) → Select "Generic CalDAV/CardDAV"
Configure the calendar profile
Name: Infomaniak Calendar
Outlook folder: Select or create an Outlook calendar
DAV URL: Paste your CalDAV URL
Username: Your Infomaniak email
Password: Your Infomaniak password
Test the connection
Click "Test or discover settings". If everything is correct, you will see a success message.
Save
Click OK to save the profile.
Step 5: Configure Contact Synchronization
Repeat the process for contacts:
- Create a new profile ("+" button)
- Select "Generic CalDAV/CardDAV"
- Configure with the CardDAV URL and your credentials
- Select a Contacts folder in Outlook
- Test and save
Recommended Settings
For optimal synchronization, adjust these settings in each profile:
| Setting | Recommended Value | Explanation |
|---|---|---|
| Sync interval | 15 minutes | Balance between responsiveness and server load |
| Conflict resolution | Server wins | In case of conflict, the server takes priority |
| Synchronization mode | Two-way | Bidirectional synchronization |
Manual Synchronization
To force an immediate sync:
- Click "CalDAV Synchronizer" → "Synchronize now"
- Or use the keyboard shortcut: Ctrl+Shift+S
Troubleshooting Common Issues
"401 Unauthorized" Error
- Check your credentials (email and password)
- Make sure you\'re using the correct password (not a Google app password)
"404 Not Found" Error
- The CalDAV/CardDAV URL is incorrect
- Verify the URL in Infomaniak webmail
Calendar Empty After Sync
- Verify you\'re syncing the correct calendar (not the default empty calendar)
- Try "Test or discover settings" to automatically detect available calendars
Duplicate Events
- Make sure you haven\'t configured two profiles for the same calendar
- Verify that "Two-way" mode is selected
CalDAV Synchronizer Support
The project is open source. For persistent issues, consult the official documentation or open a ticket on GitHub.
Alternative: The New Outlook
Microsoft is working on a "new Outlook" that should natively support CalDAV/CardDAV protocols. Until its general availability, CalDAV Synchronizer remains the most reliable solution for classic Outlook.
Conclusion
CalDAV Synchronizer transforms Outlook into a fully compatible email client for Infomaniak. Installation takes 10 minutes and lets you enjoy your Swiss calendars and contacts directly in your usual application.
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