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Last Updated: September 14, 2023

Important: After reviewing customer feedback, the Outlook Team will be implementing an option to re-enable editing meetings.  We will update this topic with the specifics and initial release build as soon as they are available.  The plan specifics include:

  • A non-policy registry key that will enable editing all meetings (internal and external)

  • A release plan that includes backporting to main M365 channels through to Semi-Annual Enterprise Channel Version 2302

  • The current anticipated production release date is Tuesday, October 10, 2023.


When you receive meeting items sent from any other sender (internal or external), the security update makes two changes:

  1. The meeting is now read only for the recipient. It is no longer possible to make changes to the body of the meeting or to attach files to the meeting.

  2. Images in the meeting item that are stored on network paths such as UNC shares (\\server), file share paths (File://server), or external URL paths (https://) are blocked.

Outlook blocked image

This issue happens after installing the Outlook Desktop August 8th, 2023, security updates. For additional information see the respective CVE below:


If the image path is legitimate, you can still download the image to view it.

  1. Right-click the image.

  2. Select Download Pictures or Save as Picture as appropriate.
    Outlook Download or Save as Picture

The meeting body is read only. If you need to keep notes on the meeting, consider these alternate solutions: 

Normally adding the external sender to Safe Senders would enable the pictures to download automatically and the calendar item would be editable. For external received calendar items this will no longer apply and the resolution steps above are required.

Additional Resources

Add recipients of my email messages to the Safe Senders List

Block or unblock automatic picture downloads in email messages

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See Also

Fixes or workarounds for recent issues in Outlook for PC

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