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I've created an add-in for Outlook which uses the Exchange REST API to load email headers and forward emails. In my O365 environment it works without any problem. Now I try to deploy the add-in at one of my clients.

They have a classic on-premise Exchange 2016 server. The deployment of the plugin works, but now I have problems that the IIS / Exchange blocking my API request because of CORS. The Plugin is hosted on an external server.

I've got the following error: Error

I think I have to make some changes to the HTTP Response Headers in the IIS. I tries something like this: Try

But it doesn't work. Any suggestions where and how I need to configure the IIS to allow calls to the API from external origin?

Gerald Schneider
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Werewolve
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1 Answers1

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You also could post this issue in https://social.technet.microsoft.com/Forums/exchange/en-US/home?forum=exchangesvrdevelopment

Jayce
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