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How to set/get PR_SECURITY_FLAGS/PR_MESSAGE_CLASS MAPI properties using Outlook JavaScript or EWS

OutlookAddinDevJZ 0 Reputation points
2023-05-02T19:27:13.9266667+00:00

To develop Outlook web add-ins, is that possible to set/get MAPI properties such as PR_SECURITY_FLAGS/PR_MESSAGE_CLASS in a compose message?

https://learn.microsoft.com/en-us/office/dev/add-ins/outlook/get-and-set-item-data-in-a-compose-form

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