How to enable or disable Cache Exchange Mode in Outlook

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  1. Close Outlook.
  2. Select the Windows Start icon > Control Panel.
  3. Select Mail.
  4. Select Email Accounts.
  5. Select the Email tab.
  6. Highlight the email address giving you the warning (email.ost), then select Change.
  7. Either tick or remove the tick from Use Cached Exchanged Mode.
  8. Select Next.
  9. Select Finish.


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