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Important
The SharePoint Add-In model in SharePoint Online has been deprecated on November 27, 2023 and fully retired on April 2, 2026. For more information, see SharePoint Add-In retirement in Microsoft 365.
The recommended replacement technology for the SharePoint add-in model is SharePoint Framework (SPFx).
August 2015 Update:The Mail Add-in manifest designer now respects the Mailbox requirement set value.