Exchange 2013 is not as easy to do http redirection as 2010. It took a lot of trolling the forums to find a process that works for me and I thought I’d share it with you.
The process is three easy steps – make sure you do all three!
Step 1. Locate the Web.Config file it should be in your inetpub folder. For most of us that’s C:\inetpub\wwwroot but for many of you it could be located on another drive.
Open the Web.config file as an administrator file and open it with Notepad.
*Note Lines 2 and 4 I have added the <!– –> comments to keep from loading the Modules. Add these comment brackets and save the file.
Step 2. While you’re still working out of the Inetpub\wwwroot folder you’ll want to create a new file called Default.htm and paste the code into it and save it.
Step 3. Open IIS Manager and Highlight the Default Website. In the Center pane under IIS choose Error Pages. In the Actions Pane choose Add and create a new Custom Error Page.
In the Status code box Type: 403.4 then choose the Respond with a 302 redirect and type the complete path to OWA
Once you’ve finished click ok and then Do an IISReset to start using the changes.