To access emails offline in Outlook Web App: Log in to Outlook Web App with Office 365 account>Settings > Offline settings. For more details, here is an article. To access emails offline in Outlook 2013/2016: Log in to Outlook, click File>info. C

The fastest way to work offline is to use the default Outlook settings. If you want to customize the settings, including where to save the offline Outlook Data File (.ost), use the Customized setup instructions. Quick setup. On the Send / Receive tab, in

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