You may require to offload OST file data to PST files or archive old mailboxes to keep the OST file size under recommended limits. If you use a device, such as Windows tablet or Ultrabook, that doesn’t have enough storage space available on the disk, you may want to configure Outlook in online mode. Limitations of Cached Exchange ModeĪs Cached Exchange Mode keeps a copy of mailbox items on the local drive, it requires storage space on the local drive. Cached Exchange mode can help you overcome such issues. If Outlook in online mode does not get a response from the server within 100 ms, it starts displaying error messages. Instead, it looks into the local cache (OST) for the searched mail item.īesides, Cached Exchange mode is advisable for high latency and slow network connection. Similarly, searching emails or any mail items is quick and easy as it does not require Outlook to fetch information from the server.
It also downloads the Shared Folders or Public folders in the OST file.
This helps you quickly look up or find recipients in your organization while sending an email. The Outlook also stores the GAL or Global Address List in the OST file. Thus, users can continue working when online or offline seamlessly. Outlook does not display any error in case the system experiences network issues. The Cached Exchange Mode is preferred when your network often experiences connectivity issues or if you travel for work. Advantages of Cached Exchange Mode in OutlookĬached Exchange Mode was introduced with Outlook 2003. 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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