Outlook CalDav Synchronizer is a free Outlook Plugin that synchronizes events, tasks, and contacts between Outlook and Google, SOGo, Nextcloud, Horde, or any CalDAV or CardDAV server.

Outlook CalDav Synchronizer originated as a master’s thesis project at the University of Applied Sciences Technikum Wien, specifically within the Software Engineering degree program. The project aimed to address the growing need for seamless synchronization between Microsoft Outlook and various CalDav-compatible calendar services. By leveraging advanced software engineering principles and methodologies, the project sought to provide users with a reliable tool for managing their calendar data across different platforms.

The thesis not only encompassed the development of the synchronization tool but also included a comprehensive analysis of existing solutions, user requirements, and best practices in software design. This academic foundation paved the way for the creation of a versatile and effective application that is still in use today.

Outlook CalDav Synchronizer supports 2021, 2019, 2016, 2013, 2010, 2007, and Office 365 for Desktop.

Outlook CalDav Synchronizer Features:

● Free and Open Source software (FOSS), the only free Outlook CalDav plugin (AGPL license)
● tested CalDAV servers: SOGo, Google Calendar, Horde Kronolith, NextCloud, OwnCloud, SabreDAV, Synology NAS, GroupOffice, one.com, Yandex, OpenX-change, Posteo, Landmarks, Kolab, Zoho Calendar, GMX, Tine 2.0, Fruux, Mac OS X Server, iCloud, Mail.ru, Radicale, Cozy Cloud, Cyrus Imap 2.5, mailbox.org
● Two-way-sync
● Modern WPF GUI
● Supporting OAuth2 for Google
● SSL/TLS support, support for self-signed certificates
● Manual proxy configuration support for NTLM or basic auth proxies
● Autodiscovery of calendars and address books via well-known redirects or DNS SRV/TXT lookups
● Configurable sync range
● Sync multiple calendars per profile
● Sync reminders, categories, recurrences with exceptions, importance, transparency
● Dync organizer and attendees and own response status
● Task support
● CardDAV support to sync contacts (distribution lists planned)
● 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)
● Sync contact pictures, categories, notes, and x509 certificates
● Manual or time-triggered sync
● Change-triggered sync
● Sync triggered by Outlook Send/Receive
● Category Filtering (sync CalDAV calendar to Outlook categories)
● Map CalDAV server colors to Outlook category colors
● Show reports of last sync runs and status
● Configurable system Tray Icon with notifications
● Bulk creation of multiple profiles
● Use server settings from Outlook IMAP/POP3 account profile
● Map Windows to standard IANA/Olson time zones
● Configurable mapping of Outlook custom properties