Outlook CalDav Synchronizer is a useful Outlook Plugin, that can synchronize different tasks, contacts and events between Outlook and a CalDAV or CardDAV server. Overall, it is absolutely free and supports synchronization between SOGo, Horde, and, of course, Google. In addition, 3Outlook versions 2007, 2010, 2013 and 2016are supported. Main features are: - Two-way-synchronisation. - Modern WPF graphic interface. - Supporting OAuth2 for Google.SSL/TLS support, support for self-signed certificates. - Manual proxy configuration support for NTLM or basic author proxies. - Discover of address books as well as calendars automatically. - Map CalDAV server colors to Outlook category colors. - Sync numerous calendars , as well as categories and reminders, recurrences with importance, transparency, exceptions for each profile. - Supporting Google Task lists (sync via Google Task Api with Outlook task folders). - CardDAV support to sync contacts (distribution lists planned). - Google native Contacts API support with mapping of Google contact groups to Outlook categories. - Contact categories, images, x509 certificates and notes can be synced. - Change / Manual / Time - triggered sync. - Filtering categories (sync CalDAV calendar to Outlook categories). - Reports of last synchronization runs and status are shown. Configurable system Tray Icon with notifications. - Configurable sync range. - Creating Bulk of multiple profiles. Tested CalDAV servers contain: iCloud, Google Calendar, OwnCloud, Mail.ru SabreDAV, Yandex Synology NAS, GroupOffice, SOGo, one.com, , OpenX-change, Fruux, Posteo, Landmarks, Zoho Calendar, GMX, Tine 2.0, Kolab, Radicale, Horde Kronolith, , Mac OS X Server.