# aluxnimm/outlookcaldavsynchronizer

Sync Outlook with Google, SOGo, Nextcloud or any other CalDAV/CardDAV server

Repository: https://github.com/aluxnimm/outlookcaldavsynchronizer
Canonical: https://ross.abutalabs.com/products/outlookcaldavsynchronizer
Language: C#
License: AGPL-3.0
License Family: copyleft
Topics: caldav, carddav, outlook, synchronization, google-calendar, calendar, contacts, tasks
Last push: 2026-08-17T11:55:38+00:00

## Health v2 (maintenance only)
Score: 90/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 98, release rhythm 74, longevity 100
- inputs: {"age_days": 4062, "days_push": 16, "days_rel": 16, "gap_med": 159, "n_releases_24m": 4}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1085, forks 107 (observed 2026-08-28T04:03:31.612886+00:00)

## What it is
An Outlook plugin that synchronizes events, tasks, and contacts between Microsoft Outlook and any CalDAV/CardDAV server such as Google, Nextcloud, SOGo, or iCloud. It is free, open-source software (AGPL-3.0) supporting Outlook 2007 through 2021 and Office 365 for Desktop.

## Use cases
- sync outlook calendar with nextcloud
- two-way sync outlook with google calendar
- sync outlook contacts with a carddav server
- use outlook with radicale or baikal caldav server
- replace exchange with caldav for outlook users
- sync outlook tasks with caldav server
- keep outlook and icloud calendar in sync

## When to choose
- you use Outlook on Windows and want to sync with a CalDAV/CardDAV server instead of Exchange
- you want a free, open-source Outlook CalDAV plugin
- you run Nextcloud, SOGo, Radicale, Baïkal, or similar self-hosted groupware
- you need two-way sync of events, tasks, and contacts with broad server compatibility

## When to avoid
- you use Outlook on macOS or mobile - the plugin is Windows-only
- you need Exchange or EWS sync rather than CalDAV/CardDAV
- you want a standalone sync tool not tied to Outlook
- you require a permissive license for proprietary redistribution (it is AGPL-3.0)

## Facets
- artifact type: plugin
- maturity: active
- function: scheduling, backup, email
- domain: developer-tools, self-hosted, cross-platform
- platform: windows
- tags: caldav, carddav, outlook, calendar-sync, contacts-sync, tasks-sync, nextcloud, google-calendar, outlook-plugin

## Member repositories
- aluxnimm/outlookcaldavsynchronizer (main) score 90

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:31.612886+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T06:49:42.270075+00:00, confidence not recorded.
  - readme: https://github.com/aluxnimm/outlookcaldavsynchronizer (fetched 2026-08-28T04:03:31.612886+00:00, sha f7cef8df92a2)
- Data as of 2026-08-30T08:39:29.467469+00:00.