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Outlook CalDav Synchronizer (Install)


This package skips automatic verification:

Requires .NET 4.61

This package was approved as a trusted package on 6/26/2019.

Outlook Plugin, which synchronizes events, tasks and contacts between Outlook and Google, SOGo, Horde or any other CalDAV or CardDAV server. Supported Outlook versions are 2016, 2013, 2010 and 2007.

This project was initially developed as a master thesis project at the University of Applied Sciences Technikum Wien, Software Engineering Degree program. Outlook CalDav Synchronizer is Free and Open-Source Software (FOSS).

Tested CalDAV Servers

  • Baïkal - Cozy Cloud - cPanel - Cyrus Imap 2.5 - DAViCal - Fruux - GMX - Google Calendar - Group-Office - Horde Kronolith - iCloud - Kolab - Landmarks - Mac OS X Server - - - Nextcloud - - OpenX-change - Owncloud - Posteo - Radicale - SabreDAV - SOGo - Synology DSM - Tine 2.0 - Yahoo - Yandex - Zimbra 8.5 - Zoho Calendar


  • open source AGPL, the only free Outlook CalDav plugin
  • two-way-sync
  • SSL/TLS support, support for self-signed certificates and client certificate authentication
  • Manual proxy configuration support for NTLM or basic auth proxies
  • Autodiscovery of calendars and addressbooks
  • configurable sync range
  • sync multiple calendars per profile
  • sync reminders, categories, recurrences with exceptions, importance, transparency
  • sync organizer and attendees and own response status
  • task support
  • Google native Contacts API support with mapping of Google contact groups to Outlook categories.
  • Google Tasklists support (sync via Google Task Api with Outlook task folders)
  • CardDAV support to sync contacts (distribution lists planned)
  • time-triggered-sync
  • change-triggered-sync
  • manual-triggered-sync
  • Category Filtering (sync CalDAV calendar/tasks to Outlook categories)
  • map CalDAV server colors to Outlook category colors
  • show reports of last sync runs and status
  • System TrayIcon with notifications
  • bulk creation of multiple profiles
  • Use server settings from Outlook IMAP/POP3 account profile
  • Map Windows to standard IANA/Olson timezones
  • Configurable mapping of Outlook custom properties
  • create DAV server calendars/addressbooks with MKCOL
  • Map Outlook formatted RTFBody to html description via X-ALT-DESC attribute

NOTE: Requires .NET framework 4.6.1.


You can pass the following parameters:

  • Install for all users not just the current user: /allusers


-params '"/allusers"'

NOTE: This is an automatically updated package. If you find it is out of date by more than a week, please contact the maintainer(s) and let them know the package is no longer updating correctly.

To install Outlook CalDav Synchronizer (Install), run the following command from the command line or from PowerShell:

C:\> choco install outlookcaldav

To upgrade Outlook CalDav Synchronizer (Install), run the following command from the command line or from PowerShell:

C:\> choco upgrade outlookcaldav


  • tools\chocolateyinstall.ps1 Show
    $ErrorActionPreference = 'Stop'
    # create temp directory
    do {
        $tempPath = Join-Path -Path $env:TEMP -ChildPath ([System.Guid]::NewGuid().ToString())
    } while (Test-Path $tempPath)
    New-Item -ItemType Directory -Path $tempPath | Out-Null
    $packageArgs = @{
      packageName   = $env:ChocolateyPackageName
      unzipLocation = $tempPath
      fileType      = 'MSI'
      url           = ''
      checksum      = 'c0da33561bbcf0e6d7f65c8fd6838b17cf688c7e5249b9fbc5466fc5a76dbd8c'
      checksumType  = 'SHA256'
      silentArgs    = "/qn /norestart"
      validExitCodes= @(0, 3010, 1641)
    $arguments = Get-PackageParameters -Parameter $env:ChocolateyPackageParameters
    if ($arguments.ContainsKey("allusers")) {
        $packageArgs.silentArgs += " ALLUSERS=1"
    # Unzip the file to the tempPath and then install the MSI
    Install-ChocolateyZipPackage @packageArgs
    $packageArgs.file = Join-Path -Path $packageArgs.unzipLocation -ChildPath 'CalDavSynchronizer.Setup.msi'
    Install-ChocolateyInstallPackage @packageArgs
  • tools\chocolateyuninstall.ps1 Show
    $ErrorActionPreference = 'Stop'
    $packageArgs = @{
        packageName    = $env:ChocolateyPackageName
        softwareName   = 'CalDavSynchronizer*' 
        fileType       = 'MSI'
        silentArgs     = '/qn /norestart'
        validExitCodes = @(0, 3010, 1605, 1614, 1641)
    [array]$key = Get-UninstallRegistryKey @packageArgs
    if ($key.Count -eq 1) {
        $key | ForEach-Object { 
            $packageArgs['file'] = "$($_.UninstallString)"
            if ($packageArgs['fileType'] -eq 'MSI') {
                $packageArgs['silentArgs'] = "$($_.PSChildName) $($packageArgs['silentArgs'])"
                $packageArgs['file'] = ''
            Uninstall-ChocolateyPackage @packageArgs
    elseif ($key.Count -eq 0) {
        Write-Warning "$env:ChocolateyPackageName has already been uninstalled by other means."
    elseif ($key.Count -gt 1) {
        Write-Warning "$key.Count matches found!"
        Write-Warning "To prevent accidental data loss, no programs will be uninstalled."
        Write-Warning "Please alert package maintainer the following keys were matched:"
        $key | ForEach-Object {
            Write-Warning "- $_.DisplayName"

Virus Scan Results

In cases where actual malware is found, the packages are subject to removal. Software sometimes has false positives. Moderators do not necessarily validate the safety of the underlying software, only that a package retrieves software from the official distribution point and/or validate embedded software against official distribution point (where distribution rights allow redistribution).

Chocolatey Pro provides runtime protection from possible malware.


Package Maintainer(s)

Software Author(s)

  • Gerhard Zehetbauer
  • Alexander Nimmervoll


2017 Gerhard Zehetbauer and Alexander Nimmervoll


Release Notes

Version History

Version Downloads Last updated Status
Outlook CalDav Synchronizer (Install) 3.6.1 398 Wednesday, April 24, 2019 approved
Outlook CalDav Synchronizer (Install) 3.6.0 325 Wednesday, April 10, 2019 approved
Outlook CalDav Synchronizer (Install) 3.5.0 461 Tuesday, February 26, 2019 approved
Outlook CalDav Synchronizer (Install) 3.4.0 395 Sunday, January 13, 2019 approved
Outlook CalDav Synchronizer (Install) 3.3.0 341 Monday, December 10, 2018 approved
Outlook CalDav Synchronizer (Install) 3.2.1 404 Wednesday, September 12, 2018 approved
Outlook CalDav Synchronizer (Install) 3.2.0 413 Thursday, May 17, 2018 approved
Outlook CalDav Synchronizer (Install) 3.1.1 258 Wednesday, May 2, 2018 approved
Outlook CalDav Synchronizer (Install) 3.1.0 328 Sunday, March 25, 2018 approved
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