Sign in with Microsoft
Sign in or create an account.
Select a different account.
You have multiple accounts
Choose the account you want to sign in with.


This article discusses a change in behavior in Outlook for Mac when a meeting organizer changes meeting details or add/removes attendees from an existing meeting request.


We introduced a new calendar sharing feature in Outlook for Mac starting in build 16.23.1. This new feature utilizes the REST protocol instead of the EWS protocol. This feature is for Microsoft 365 subscribers only. Benefits of this feature are documented here: Outlook for Mac improves calendar sharing performance with REST.

As the organizer of a meeting, you can change the meeting details or add or remove attendees. Starting with the new REST sync model there is a change in the behavior where the Outlook for Mac client no longer prompts for sending the meeting updates. Prior to REST calendar sync, when an attendee was added or deleted, the organizer was prompted with the following dialog below asking to send the update to all attendees or to changed only.

You have added or deleted attendees.

With the new REST sync, the updates are sent to changed attendees (add/delete) only. When you make changes in the meeting details such as time/date, subject, or body of the meeting, the update is sent to all attendees.

More Resources

Icon Experts (brain, gears)

Ask the experts

Connect with experts, discuss the latest Outlook news and best practices, and read our blog.

Outlook Tech Community

Icon Community

Get help in the community

Ask a question and find solutions from Support Agents, MVPs, Engineers, and Outlook users.

Outlook Forum on Answers

Icon feature request (light bulb, idea)

Suggest a new feature

We love reading your suggestions and feedback! Share your thoughts. We're listening.

Provide feedback

Fixes or workarounds for recent issues in Outlook for Mac

Need more help?

Expand your skills
Explore Training
Get new features first
Join Microsoft Insiders

Was this information helpful?

What affected your experience?

Thank you for your feedback!