Exchange Server 2010: Accessing shared mailbox via EWS API is failing with 401 error.

Question

I have created a new mailbox on Exchange Server 2010 and made it a shared mail box by giving full access permissions to a group of users.

This mailbox is accessible from OWA but not form EWS Managed API.

Accessing this via API always fails with 401 Unauthorized access errors.

I tried with EwsEditor 1.18 and I get the same error.

Could you please help me in resolving this.

Answer 1

Hey there

Guess you  might want to check the authentication type your using in your code eg are you trying to use basic authentication where the default in EWS would be NTLM and the basic will be disabled by default.

If you want to enable Basic you can perform the below:

Go to Internet Information Services Manager -> Sites -> Default Web Site -> EWS -> Authentication -> Basic Authentication: Set to enabled

So basically the problem lies on identifying your code using which type of authentication and enabling them on the EWS will most likely solve your issue

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