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Symtoms

Outlook Web Access (OWA) does not display properly on Internet Explorer 10. CSS code is displayed at the top of the page. Javascript doesn't load properly and the list of messages keeps displaying the message "Loading...".



Outlook Web Access (OWA) on Internet Explorer 10

Cause

Outlook Web Access (OWA) is incompatible with Internet Explorer 10.

Solution

You can implement a work-around on the client, or centrally on your Exchange server.

Client Side

1. Press F12.
2. Set Browser mode to Internet Explorer 10 Compatibility mode.

Or...

Server Side

Add the HTTP header "X-UA-Compatible: IE=EmulateIE8" to Exchange. This header will instruct Internet Explorer 10 to render Outlook Web Access the "old-fashioned" way.

1. Open Internet Information Services (IIS) Manager.
2. Navigate to Websites, Default Websites.
3. Open Properties for Exchange.
4. Open the tab HTTP Headers.
5. Click Add...
6. Custom header name: "X-UA-Compatible" (without the quotation marks)
7. Custom header value: "IE=EmulateIE8" (without the quotation marks)
8. Click OK. 

Custom HTTP header for OWA

You need to restart your webbrowser for the changes to take effect.