After you send an email using Microsoft Outlook 2007, Microsoft Outlook 2010, or Microsoft Outlook 2013, a copy of the email message is not saved to the Sent Items folder.

The Save copies of messages in the Sent Items folder option in Outlook is disabled.

Enable the Save copies of messages in the Sent Items folder option by following the steps below for your version of Outlook.

In Outlook 2010 and 2013:

1. Click File, and then Options.
2. In the Outlook Options dialog, click Mail.  
3. Under the Save messages section, enable the Save copies of messages in the Sent Items folder option.
   
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4. Click OK.

In Outlook 2007:

1. Click Tools, and then Options.
2. Under the Preferences tab, click E-mail Options...
3. Enable the Save copies of messages in Sent Items folder option.
   
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4. Click OK.

The Save copies of messages in Sent Items folder option can be controlled using the Outlook Group Policy setting. You can find the policy setting below, depending on your version of Outlook.

Outlook 2007: 





Outlook 2010:





Outlook 2013:




In the dialog box for the policy setting, click Enabledto enable the policy and select the Save copies of messages in Save Items folderoption (The screen shot for this step is listed below).




The Registry keys associated with the Save copies of messages in Sent Items folder option are as follows:

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

Where x.0 is your version of Outlook:

DWORD Value Name: SaveSent
Value Data: