Items Stay In The Outbox and Never Clear

If someone sends an email “as” someone else, the email will be sent but the item will remain in the outbox The fix is easy – in Outlook you need to enable cache mode.

In Outlook 2010:

  • Click on File
  • Click on Account Settings button –> Account Settings…
  • On the Email tab, double-click on Microsoft Exchange
  • Select the option Use Cached Exchange Mode
  • Click Next and Finished to complete the change
  • You will need to Restart Outlook for the change to take effect.

In Outlook 2007:

  • Click on Tools –>¬†Account Settings
  • On the Email tab, double-click on Microsoft Exchange
  • Select the option Use Cached Exchange Mode
  • Click Next and Finished to complete the change
  • You will need to Restart Outlook for the change to take effect.