Outlook calendar sync for Microsoft 365 and Outlook.com

What changed with the EWS shutdown

For years, many sync tools, scripts and Outlook add-ins talked to Exchange through Exchange Web Services (EWS). Microsoft is retiring it in Exchange Online:

If your old sync stopped this fall with sign-in or connection errors, EWS is a likely cause. On-premises Exchange servers aren't affected.

AllMyMeetings never used EWS. It talks to your calendar through Microsoft Graph, the API Microsoft points developers to as EWS's replacement, and receives change notifications from Graph instead of polling.

Microsoft 365 work accounts vs Outlook.com

Both connect through the same Connect Outlook button, but they behave differently:

Either one can be the source or the destination of a sync.

Two-way sync with Google and iCloud

Create a sync pair between an Outlook calendar and a Google or iCloud calendar, then choose one-way or two-way:

• Outlook ↔ Google: both sides send change notifications, so edits usually appear on the other side within seconds.
• Outlook ↔ iCloud: Outlook changes arrive by notification; iCloud doesn't offer push to third parties, so we check iCloud for changes every few minutes.

Pick what the copy shows. Free/Busy writes a private "Busy" block with the time only, which is what most people want on a work calendar: colleagues see you're unavailable, not "Pediatrician". Every calendar is also re-checked at least hourly in case a notification is missed. Attendees are never copied, so a synced copy never emails your colleagues.

Two-way sync, real-time notifications and full-detail copies are on Pro ($5 a month). The free plan runs one one-way Free/Busy sync, which is enough to block your work calendar with personal events.

Step-by-step guides for the native options: Google Calendar with Outlook and iCloud calendar with Outlook.

Tenant admin consent: what IT will ask

If your organization requires admin approval, the request lands with IT. These are the answers they'll want:

• What it accesses: your calendars (read and write), your basic profile and your mailbox settings (for your time zone). No mail, contacts, files or directory data.
• Permission type: delegated permissions only. AllMyMeetings acts as you, on your mailbox, and can't read anyone else's.
• Publisher: Wolfgang Solutions, LLC, shown with Microsoft's verified-publisher badge on the consent screen.
• API: Microsoft Graph, so it keeps working after EWS is turned off.
• Storage: sign-in tokens are encrypted before they're stored, and all traffic uses HTTPS. The security page lists exactly what is stored and for how long.
• Removal: disconnecting the account in AllMyMeetings deletes its tokens and removes the copies it synced to other calendars. Admins can also revoke the app in the Entra admin center.

Setup

1. Connect Outlook. Click Connect Outlook and sign in with your Microsoft 365 or Outlook.com account. Microsoft shows the permission screen below. Accept, or request approval if your organization requires it.
2. Turn on the calendars you want. Your Outlook calendars are listed after connecting; nothing syncs until you choose.
3. Create a sync pair with your Google or iCloud calendar, choose the direction and mode, and save. The first sync starts right away.

Microsoft's permission screen for AllMyMeetings, captured November 10, 2026 with a personal Outlook.com account. Work and school accounts see a similar screen listing the same permissions.