The Microsoft Report Message and Report Phishing add-ins are now in maintenance mode and will eventually be deprecated.
We recommend transitioning from the add-ins to the built-in Report button. The Report button is supported in virtually all consumer and enterprise Outlook clients.
For more information, see the Frequently asked questions section in this article.
- DOCS: Transition from the Microsoft Report Message or the Report Phishing add-ins
https://learn.microsoft.com/en-us/defender-office-365/submissions-users-report-message-add-in-configure
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