If you have never configured OWA for EV then you should follow the steps in the guide, there is no quick resolution here. If you have had it working before then you need to specify what works and what doesn't.
Outlook Anywhere is associated with OWA. By default Outlook anywhere gets disabled so you need to enable it and configure the Email client as Outlook Anywhere on internet, it will works fine.
Firstly the EV on OWA was working after EV deployed, EV icon can be seen in the OWA.
But recently my colleagues troubleshoot on EV and reinstall the OWA Extensions\OWA 2007 Extensions
then the problem started. EV icons in OWA disappear.
And the public name for EV is different from internal alias that I used, so I need to check how I can link