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

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

Outlook CalDav Synchronizer supports Outlook 2007, 2010, 2013, and 2016.

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
sync 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 timezones
Configurable mapping of Outlook custom properties

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