Therefore, if the server is offline due to maintenance or the internet is unavailable, you won’t be able to access your Outlook emails. On the contrary, in Online mode, Outlook needs a constant connection with the mailbox server. The changes are synchronized with the mailbox on the server as soon as the system and Outlook connect to the internet and Exchange mailbox server. The OST file allows Outlook users to continue working even when the system is offline or the server isn’t available. In Offline or Cached Exchange Mode, the Outlook creates and stores a synchronized copy of mailbox items, such as emails, contacts, calendar items, notes, tasks, etc., in an Offline Folder file or OST (Outlook Storage Table). When an Exchange account is configured in Outlook, it connects to the Exchange server in Offline mode with Cached Exchange Mode enabled by default. Microsoft Outlook can connect with Exchange server in two different modes, i.e., Offline Mode and Online Mode.
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