CalDAV Sync with Google Calendar & Microsoft 365

The problem

Calendar sync shouldn't be this hard

No CalDAV support

Google Calendar and Microsoft 365 don't speak CalDAV. There's no native way to connect your self-hosted calendar.

Outlook CalDAV Synchronizer doesn't work with New Outlook

The Outlook CalDAV Synchronizer is a COM Add-in — and the new Outlook no longer supports COM Add-ins. As Microsoft rolls out New Outlook via Windows Update, more users are affected.

ICS feeds are too slow

ICS subscriptions are read-only and update only every 24–48 hours. Not useful for up-to-date scheduling.

The solution

The missing bridge between CalDAV and the cloud

CalDAVconnect sits between your CalDAV server and the cloud. It uses webhooks for Google Calendar and Microsoft 365 → CalDAV (1–2 seconds), and efficient CTag-based polling for CalDAV → cloud (avg. 7–8 seconds). No full calendar scans — just a lightweight change detection signal.

Events from the last 90 days and all future events are synced — keeping your cloud calendar clean and relevant.

Compatibility

Works with your CalDAV server

CalDAVconnect works with any standard CalDAV server that supports the CalDAV protocol.

Infomaniak Read guide

mailbox.org Read guide

Posteo Read guide

Use cases

Built for real-world setups

Your self-hosted calendar, synced to Google Calendar in seconds.

CalDAVconnect keeps your CalDAV calendar in sync with Google Calendar — no matter which server you use. Bidirectional, syncs in seconds, no ICS feed delays.

Webhooks for Google → CalDAV, smart polling for CalDAV → Google — syncs in seconds
Tested with Nextcloud, SOGo, Radicale, Baïkal, Synology, Posteo, mailbox.org and Infomaniak
Setup takes less than 5 minutes

Connect your CalDAV server to Microsoft 365 — without COM Add-ins.

The Outlook CalDAV Synchronizer relied on COM Add-ins, which the new Outlook no longer supports. CalDAVconnect is a cloud-based bridge that works regardless of which Outlook version your team uses.

Works with new Outlook, Outlook Desktop, and Outlook Web
No client-side installation required
Complements ActiveSync with cloud-to-cloud sync

Use Calendly with your self-hosted calendar — without double bookings.

Calendly only reads availability from Google Calendar or Microsoft 365. By syncing your CalDAV calendar to Google Calendar within seconds, Calendly always sees your true availability.

Up-to-date availability for Calendly scheduling
Google Calendar acts as a live bridge
Eliminates double bookings from stale ICS feeds

Pricing

Simple, transparent pricing

Start with a free 14-day trial of the full version — full speed, all features.

No credit card · no auto-charge

When the trial ends, continue on the Free plan (1 connection · hourly sync · €0 forever) or upgrade anytime.

Solo

Pro

from €5 /month

For power users and small teams with multiple calendars. Scale up as you grow.

Syncs in seconds
5 connections included
Scales to 15 connections
Pro 10 · €8, Pro 15 · €11
Google Calendar + Microsoft 365
Bidirectional sync
GDPR compliant
Hosted in Germany

Try Pro free for 14 days

No credit card. No auto-charge. Becomes the Free plan (€0) when the trial ends.

Just need the basics?

The Free plan is free forever — 1 connection, hourly sync interval.

Start on the Free plan →

All prices incl. VAT.

Need more than 15 connections? Contact us for volume pricing.

Hosted in Germany. GDPR-native.

CalDAVconnect runs on Hetzner in Nuremberg, Germany. Your calendar data is processed exclusively within the EU. All event data is encrypted at rest.

Hetzner, Nuremberg GDPR compliant EU infrastructure Encrypted at rest

Frequently asked questions

CalDAV is an open internet standard for calendar synchronization (RFC 4791). It's used by self-hosted calendar servers like Nextcloud, SOGo, Radicale, and Baïkal. Unfortunately, Google Calendar and Microsoft 365 don't support CalDAV, which is where CalDAVconnect comes in.

About 5 minutes. Sign up, enter your CalDAV server URL and credentials, connect your Google or Microsoft account via OAuth, and select which calendars to sync. The first sync starts automatically.

The Outlook CalDAV Synchronizer is a COM Add-in that still works in Classic Outlook, but the new Outlook no longer supports COM Add-ins. As Microsoft rolls out New Outlook via Windows Update, it's increasingly becoming the default. CalDAVconnect is a cloud service that syncs server-to-server, so it works regardless of which Outlook version or email client you use.

Indirectly, yes. Calendly only reads availability from Google Calendar or Microsoft 365. By syncing your CalDAV calendar to Google Calendar within seconds via CalDAVconnect, Calendly always has up-to-date availability — eliminating the 12–48 hour delay from ICS feed subscriptions.

Changes in Google Calendar or Microsoft 365 appear in your CalDAV server within 1–2 seconds via webhooks. Changes in your CalDAV server sync to the cloud within 7–8 seconds on average via lightweight CTag polling — no full calendar scans.

CalDAVconnect has been tested with Nextcloud, SOGo, Radicale, Baïkal, Synology, Posteo, mailbox.org and Infomaniak. If your server supports the standard CalDAV protocol, it should work.

Yes. CalDAVconnect works with any Nextcloud installation that has the Calendar app enabled, including all versions of Nextcloud Hub. It connects directly to Nextcloud's CalDAV endpoint.

CalDAVconnect stores sync metadata and a cached copy of your event data to enable bidirectional sync. All event data is encrypted at rest. Our servers are located in Nuremberg, Germany (Hetzner) — no data leaves the EU.

CalDAVconnect syncs events from the last 90 days and all future events. Older events remain untouched on your CalDAV server — they simply won't be copied to Google Calendar or Microsoft 365. Recurring events that still have upcoming instances are always included, regardless of when they started.

Ready to sync your calendars?

Create your free account and set up your first sync in under 5 minutes.

Start your free trial

Sync your CalDAV calendar with Google Calendar and Microsoft 365