What to do if you want sent items to appear in the Sent Items folder of the additional mailbox

If you have the ability to send as the new mailbox you just added, then in somecases you might also want the emails yousend as to appear in the additional mailbox instead of your own Sent Items folder (the default)

The method to fix this is as follows:

  • Outlook 2010 SP1 should be installed
  • Cached mode needs to be enabled for the user’s profile in Outlook
  • Exit Outlook
  • Using Regedit, find the Registry key HKEY_Current_User\Software\Microsoft\Office\14\Outlook\Preferences\
  • Add a new DWORD registry key called DelegateSentItemsStyle and set it to 1
  • Close and Save
  • Restart Outlook

After that, items sent as a shared mailbox user will in fact be put in that user’s Sent Items If you don’t set Outlook to Cached Mode, the items will stay in the person’s Outbox and never clear, and never show up in the Sent Items.