Outlook ↔ Google
Sync Outlook and Google Calendar
Running an Outlook and a Google calendar side by side almost guarantees clashes. Kalender Sync keeps both in sync automatically – one- or two-way, with freely selectable detail level and 100% GDPR-compliant from Germany.
No credit card · set up in under 5 minutes
If you work in Microsoft Outlook (Microsoft 365 or Exchange Online) and also use a Google calendar – privately or for a second project – you know the pain: a booking in one calendar is invisible in the other, and suddenly a meeting lands on a blocked slot. The usual Microsoft or Google guides only half-solve it: an iCal subscription is one-way and slow, a full import copies all your private details across unfiltered.
Kalender Sync instead connects Outlook and Google cleanly via the official APIs – in real time, one- or two-way, and you decide how much the other calendar gets to see. No Outlook add-in, no browser extension, no admin rights for the standard case.
How it works
In sync in 3 steps
Connect Google
Sign in with Google – via the familiar consent screen, over OAuth 2.0. We receive a token, never your password. Workspace and private Gmail accounts both work.
Connect Outlook
Connect your Microsoft account (Microsoft 365, Outlook.com or Exchange Online) via the Microsoft Graph API – also over OAuth. Tenants with a strict consent policy approve once via admin consent.
Choose direction & visibility
Decide whether to sync Outlook → Google, Google → Outlook or both ways – and whether only "busy", title + time or full details are transferred. Then everything runs automatically.
One- or two-way
You choose the direction
Set, per connection, whether it mirrors one way only (e.g. Outlook → Google) or both calendars keep each other up to date (two-way sync). With two-way, a new event in Outlook automatically lands in Google – and vice versa.
Privacy
You decide what's visible
Per sync you pick one of three visibility levels: busy only, title + time, or full event details. Free/Busy is just the data-minimal default, not the ceiling – ideal when your Outlook and Google calendars carry different levels of confidentiality. You can even give blocked slots a custom name.
Connection & security
How Outlook and Google connect
Both sides connect via OAuth 2.0 – we never store your password, only an encrypted token (ChaCha20-Poly1305). "Outlook" here covers Microsoft 365 Business, Outlook.com and Exchange Online; everything runs through a single Microsoft Graph endpoint, with no add-in or COM wrapper. Strict Microsoft tenants with a publisher-consent policy need a one-time tenant-admin consent (details at /en/it-admin/). On the Google side we request calendar scopes only – no mail, contacts or Drive permissions. Sync runs over both providers' push webhooks, typical latency seconds to a few minutes.
GDPR
100% GDPR-compliant, hosted in Germany
Kalender Sync is run by PPJ Venture Labs UG in Munich and hosts exclusively at Hetzner in Germany – no US cloud provider, no overseas servers. For companies there's a data processing agreement (DPA under GDPR Art. 28). Unlike generic guides that copy your event details unfiltered, with us what should stay private stays private.
FAQ
Frequently asked questions
Can I sync Outlook and Google two-way (bidirectionally)?
Yes. Per connection you choose whether to mirror one way only or sync both ways. With two-way, a new event in Outlook automatically lands in Google – and vice versa.
Do I need an Outlook add-in or admin rights?
No. The connection runs over the official Microsoft Graph API via OAuth – no add-in, no browser extension. Only Microsoft tenants with a strict consent policy need a one-time admin consent; private Outlook.com and most M365 accounts work without one.
Does it work with Microsoft 365, Exchange Online and Outlook.com?
Yes, all three run through the same Microsoft Graph endpoint. On-premises Exchange without Microsoft 365 isn't directly supported, but can be connected read-only via an iCal feed.
Are my private event details transferred from Outlook to Google?
Only if you want them to be. By default only "busy" is transferred – title, description and attendees stay private. Per sync you can step up to "title + time" or full details.
How fast does Kalender Sync sync between Outlook and Google?
Both providers report changes via push webhook – typical latency is seconds to a few minutes, backed by a 4-hour reconciliation job.
What does Outlook-Google syncing cost?
One synchronisation is permanently free on the Free plan. More connections start at €4/month (Basic). New accounts test all Business features free for 14 days, no credit card.
Read more
Ready to connect Outlook and Google?
Connect your calendars in a few clicks – GDPR-compliant, hosted in Germany, one- or two-way.
Try free for 14 daysCurrently supported providers
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