Downloads of v 4.2.0:


Last Update:

02 Mar 2022

Package Maintainer(s):

Software Author(s):

  • Gerhard Zehetbauer
  • Alexander Nimmervoll


outlookcaldavsynchronizer outlookcaldav caldav synchronizer outlook admin

Outlook CalDav Synchronizer (Install)

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4.2.0 | Updated: 02 Mar 2022



Downloads of v 4.2.0:



Software Author(s):

  • Gerhard Zehetbauer
  • Alexander Nimmervoll

  • 1
  • 2
  • 3
Outlook CalDav Synchronizer (Install) 4.2.0

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  • 2
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This Package Contains an Exempted Check

Not All Tests Have Passed

Validation Testing Passed

Verification Testing Exemption:

Requires .NET 4.61


Scan Testing Successful:

No detections found in any package files

Learn More

Deployment Method: Individual Install, Upgrade, & Uninstall

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


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


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


Deployment Method:

📝 NOTE: This applies to both open source and commercial editions of Chocolatey.

1. Enter Your Internal Repository Url

(this should look similar to

2. Setup Your Environment

1. Ensure you are set for organizational deployment

Please see the organizational deployment guide

2. Get the package into your environment

  • Open Source or Commercial:
    • Proxy Repository - Create a proxy nuget repository on Nexus, Artifactory Pro, or a proxy Chocolatey repository on ProGet. Point your upstream to Packages cache on first access automatically. Make sure your choco clients are using your proxy repository as a source and NOT the default community repository. See source command for more information.
    • You can also just download the package and push it to a repository Download

3. Copy Your Script

choco upgrade outlookcaldav -y --source="'INTERNAL REPO URL'" [other options]

See options you can pass to upgrade.

See best practices for scripting.

Add this to a PowerShell script or use a Batch script with tools and in places where you are calling directly to Chocolatey. If you are integrating, keep in mind enhanced exit codes.

If you do use a PowerShell script, use the following to ensure bad exit codes are shown as failures:

choco upgrade outlookcaldav -y --source="'INTERNAL REPO URL'" 

Write-Verbose "Exit code was $exitCode"
$validExitCodes = @(0, 1605, 1614, 1641, 3010)
if ($validExitCodes -contains $exitCode) {
  Exit 0

Exit $exitCode

- name: Install outlookcaldav
    name: outlookcaldav
    version: '4.2.0'
    state: present

See docs at

chocolatey_package 'outlookcaldav' do
  action    :install
  source   'INTERNAL REPO URL'
  version  '4.2.0'

See docs at

cChocoPackageInstaller outlookcaldav
    Name     = "outlookcaldav"
    Version  = "4.2.0"
    Source   = "INTERNAL REPO URL"

Requires cChoco DSC Resource. See docs at

package { 'outlookcaldav':
  ensure   => '4.2.0',
  provider => 'chocolatey',
  source   => 'INTERNAL REPO URL',

Requires Puppet Chocolatey Provider module. See docs at

4. If applicable - Chocolatey configuration/installation

See infrastructure management matrix for Chocolatey configuration elements and examples.

This package was approved as a trusted package on 02 Mar 2022.


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.

$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      = '097607bea789f0d5162e407293d97e87487a83b13c0173cb2ee2da3e19285971'
  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
$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"

Log in or click on link to see number of positives.

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.

Add to Builder Version Downloads Last Updated Status
Outlook CalDav Synchronizer (Install) 4.1.0 17454 Wednesday, May 12, 2021 Approved
Outlook CalDav Synchronizer (Install) 4.0.0 19305 Tuesday, December 1, 2020 Approved
Outlook CalDav Synchronizer (Install) 3.8.2 1135 Tuesday, June 30, 2020 Approved
Outlook CalDav Synchronizer (Install) 3.8.1 342 Wednesday, June 24, 2020 Approved
Outlook CalDav Synchronizer (Install) 3.8.0 706 Friday, April 10, 2020 Approved
Outlook CalDav Synchronizer (Install) 3.7.0 875 Thursday, November 14, 2019 Approved
Outlook CalDav Synchronizer (Install) 3.6.2 978 Wednesday, June 26, 2019 Approved
Outlook CalDav Synchronizer (Install) 3.6.1 501 Wednesday, April 24, 2019 Approved
Outlook CalDav Synchronizer (Install) 3.6.0 437 Wednesday, April 10, 2019 Approved
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