KB ID 0000697 Dtd 12/10/12
Out of the box, Exchange (quite rightly) secures Outlook Web Access so that you have to access it via https. The problem is some of your users are used to accessing websites via http, (or simply typing a URL in their browser, without typing any prefix, so it defaults to http).
If you try and access OWA via http://server.domain.com/owa..
WARNING: DO NOT do this on a Microsoft SBS Server. (For SBS you need to create the custom error messages on the OWA Virtual Directory (directly)). This procedure assumes you have a stand alone Exchange CAS server with no other web services or virtual directories being served from its IIS.
1. Open IIS Manager and drill down to the Default Web Site > Error Pages.
3. Then restart the website (or reboot the server).
Note: DONT attempt to test this in the Exchange server itself! That will always show the original error, you need to test it from a client machine.
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