In addition, we recommend that you consider using Encrypting File System (EFS) or BitLocker as a robust solution. Online mode is useful in the following situations: Mailbox data is only cached in memory and never written to disk.Ĭached Exchange Mode is the preferred configuration in Outlook 2016 and is useful in the following situations:
Online Mode works by using information directly from the server, and, as the name implies, it requires a connection. We recommend always using Cached Exchange Mode with an Office 365 account.
