This KB will show how to enable Offline Access to Exchange 2013 OWA also known as Offline OWA.
This new feature is only available on Exchange Server 2013 and it will work with the followng web browsers:
Internet Expolrer 10 +
Safari 5 +
Offlline OWA is a feature that the user needs to enable however the organation can control If the feature is enable or not.
At this stage there is no way to force it from the server.
To enable Offline OWA , Open OWA in a web browser and click on the Settings icon.
Click on Offline settings
Select Turn on offline access
When done you will see the browser request to store data, Click Yes