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.

Last Updated: March 28, 2019


In REST calendars, when you remove a shared or delegated calendar in which you have edit permissions, it can result in the deletion of the events off of the owner's calendar resulting in a data loss scenario. There is no way for the owner to get those events back when this occurs.

Here's a scenario where this may occur:

  • User A shares calendar with User B and provides User B with edit or delegate permissions.

  • User B syncs down User A's calendar.

  • User B decides they no longer want to see User A's calendar and selects Remove from the menu.

  • In some cases, events are deleted or declined in User As calendar.


This issue is fixed in build 16.23.1 (19032603) and later. To get the latest update immediately, follow the steps in Update Office for Mac automatically. You can also get it in the Release notes for Office for Mac article.

We recommend installing the update as soon as possible to continue migrating to REST calendars.

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?

Want more options?

Explore subscription benefits, browse training courses, learn how to secure your device, and more.

Communities help you ask and answer questions, give feedback, and hear from experts with rich knowledge.

Find solutions to common problems or get help from a support agent.

Was this information helpful?

What affected your experience?
By pressing submit, your feedback will be used to improve Microsoft products and services. Your IT admin will be able to collect this data. Privacy Statement.

Thank you for your feedback!