This is exactly the case when users access OWA 2007 from a computer that has either Internet Explorer 10 or 11 installed – OWA Breaks!
This is in part as OWA 2007 is not officially supported on IE10 or IE11.
These are the same requirements necessary for mixed mode functionality between Exchange 2003 and Exchange 2007.
Examples of Server Manager commands for the individual requirements: Server Manager Cmd -i Web-Server Server Manager Cmd -i Web-ISAPI-Ext Server Manager Cmd -i Web-Metabase Server Manager Cmd -i Web-Lgcy-Mgmt-Console Server Manager Cmd -i Web-Basic-Auth Server Manager Cmd -i Web-Windows-Auth Server Manager Cmd -i Web-Dyn-Compression Installation of EV components Installation of the EV OWA extensions is performed by running "Veritas Enterprise Vault OWA 2007 Extensions x64.msi" (default location on install media is \OWA Extensions\OWA 2007 Extensions) on each CAS role.
For Exchange 2007, only IE9 and lower are recognized and fully supported with the full OWA Premium interface.
All other browsers receive the simpler OWA Light interface, and IE10 and IE11 are not handling the web pages as desired.
Compatibility issues also exist with Exchange 2010 and Exchange 2013 environments running OWA on IE11.
Exchange 2007 Environments: As a workaround, OWA users can turn on Compatibility View in Internet Explorer.You may also refer to the English Version of this knowledge base article for up-to-date information.There are many organizations today that have their production messaging systems on Exchange 2007, with Outlook Web Access 2007 (OWA) deployed for their users.I prefer Firefox but this is really hindering my work.I restarted Firefox, removed all plug ins, but no success with that.