Microsoft Outlook does not natively support CalDAV calendars. To keep your Thexyz Email calendar synced with Outlook, you can use Outlook CalDAV Synchronizer — a free, open-source plugin that provides reliable two-way calendar synchronization.
This guide walks you through setting it up step by step.
What You’ll Need
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A working Thexyz Email mailbox
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Microsoft Outlook (Windows)
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Internet access to install the plugin
Step 1: Download and Install Outlook CalDAV Synchronizer
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Visit the official Outlook CalDAV Synchronizer website or GitHub page
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Download the latest stable version
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Run the installer and follow the on-screen instructions
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Restart Outlook after installation to activate the plugin
Step 2: Find Your Thexyz CalDAV Calendar URL
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Log in to Thexyz Webmail
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Open the Calendar
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Locate the calendar you want to sync
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Open the calendar’s settings or options
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Copy the CalDAV URL
(You’ll need this in the next step)
Each calendar has its own CalDAV URL. Make sure you copy the correct one.
Step 3: Open the CalDAV Synchronizer in Outlook

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Open Microsoft Outlook
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In the top toolbar, click CalDAV Synchronizer
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Select Synchronization Profiles
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Click Add New Profile
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Choose Generic CalDAV/CardDAV
Step 4: Configure the Synchronization Profile
General Settings
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Profile name:
Example:Thexyz Calendar
Outlook Folder
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Choose the Outlook calendar to sync with
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You may create a new calendar folder to keep things organized
Server Settings
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Server URL:
Paste the CalDAV URL from Thexyz Webmail -
Username:
Your full email address (example:you@yourdomain.com) -
Password:
Your Thexyz Email password -
Authentication:
✔ Enable Basic Authentication
Sync Options
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Sync direction: Two-way (recommended)
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Sync interval:
Example: every 15 minutes
Step 5: Start the Sync
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Click OK to save the profile
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Select your new profile in the CalDAV Synchronizer window
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Click Start Sync
⏳ The first sync may take a few minutes, depending on how many events you have.
Step 6: Verify Everything Is Working
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Open Calendar in Outlook
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Confirm your Thexyz events appear in the selected calendar
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Test both directions:
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Add or edit an event in Outlook
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Add or edit an event in Webmail
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Confirm the changes sync both ways
Optional Settings (Advanced Users)
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Conflict resolution: Choose which side wins if changes conflict
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Logging: Enable detailed logs for troubleshooting
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Filters: Limit date ranges or specific event types
Troubleshooting Tips
Calendar not syncing?
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Double-check the CalDAV URL
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Confirm your email address and password
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Make sure Outlook was restarted after installation
Duplicate events?
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Enable deduplication in the plugin settings
Sync is slow?
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Reduce sync frequency
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Limit the date range being synced
Seeing errors?
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Review logs in the CalDAV Synchronizer settings for details