MS Outlook 2011 for Mac Error Code 18597

This solution is working for me. You can try this

1. I open outlook and then type / paste exchange server link (in my case: https://owa.compName.com/ews/exchange.asmx) in server field and then I get this error.
2. Then I change server field https://owa.compName.com/owa.
3. Now I quit outlook, quit form background running too & then again open outlook.
4. Nothing happened.
5. Then I send dummy email, it takes more than usual time to send.
6. But after that it works fine and I repeat this process when I start my laptop.

Regards
Kerry

Hi Linclon,

You can do one thing to resolve this error.
Outlook for Mac relies on Exchange Web Services (EWS), it does not support MAPI. Which is why you get this error.
So you can enable basic authentication of IIS (Internet Information Services) to access Exchange services for Mac.
To do this just go to IIS Manager in windows server and then expend default web site from left panel, if not expended. Then select EWS from left panel and select (double click) Authentication in IIS at Result panel which is at middle of window. Then in authentication just Enable Basic Authentication.

Regards
Kerry

Hi Lincoln,

You should check this link where they have described about Outlook 2011 for Mac Error Code 18597. The solution to the error code 18597 is also discussed there.