M365 Changelog: Quarantine message preview enhancement

MC280920 – Microsoft is changing the way users preview quarantined messages to provide additional security against embedded threats. With this change some components in quarantined messages will be distorted and not displayed by default. To see the full contents of the message, users can choose to reveal the full message.

This message is associated with Microsoft 365 Roadmap ID 82098

When this will happen:

• Microsoft will begin rolling this out to standard release customers in mid-September and they expect to be complete by the end of September.
• Microsoft will begin rolling this out to government customers in end of September and they expect to be complete by the early of October

How this will affect your organization:

Users will not initially see all components of a message in quarantine until they click the button to load external resources within the message.

Initial View

Enhanced View

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What you need to do to prepare:

No action required. You may want to update your documentation accordingly.