Note If you're running Outlook 2013 or a later version, you don't have to install any hotfix.
 

  1. Click Start, click Run, type regedit, and then click OK.
  2. Locate and then click the following registry subkey:
     

    HKEY_CURRENT_USER\Software\Microsoft\Office\x.0\Outlook\Preferences

    Note The x.0 placeholder represents your version of Office (16.0 = Office 2016, 15.0 = Office 2013, 14.0 = Office 2010).

  3. On the Edit menu, point to New, and then click DWORD Value.
  4. Type DelegateSentItemsStyle, and then press Enter.
  5. Right-click DelegateSentItemsStyle, and then click Modify.
  6. In the Value data box, type 1, and then click OK.
  7. Exit Registry Editor.