How to make sent items go into a secondary (shared mailbox) instead of your own

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_USERSoftwareMicrosoftOfficex.0OutlookPreferences

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 Editmenu, 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 databox, type 1, and then click OK.
7. Exit Registry Editor.