Today’s (Cloud) Tip…Offline Access for Outlook Web Access (OWA)
Although it sounds counterintuitive, OWA does have an offline mode. Offline access lets you use Outlook Web App on your laptop or desktop computer when you’re not connected to the Internet. After you’ve enabled offline access, Outlook Web App will work in an offline mode as needed depending on your network connection. When you’re online, Outlook Web App will automatically update the offline information. To use offline access, you need at least Internet Explorer 10, Safari 5, or Chrome 24.
For more details, please see http://office.microsoft.com/en-us/support/using-outlook-web-app-offline-HA102828007.aspx.