If you want to change the default account to use Mail Merge To send a message in Outlook 2013, 2010, or 2007, Outlook uses the default e-mail accounts to send new messages unless you specify an additional account to send a particular e-mail message by changing. The "From" address frame. And if you want to send bulk email from a secondary account, you can use the " Mail Merge "Outlook does not allow to specify another account in the" From: "box, but you can still temporarily change the default account from the option. Account Email . After using Mail Merge, switch account to default account. However, this solution does not work on new versions of Outlook (Outlook 2013 and Outlook 2010) because in these versions you also have to change the default Outlook data files (.PST).
Change account for Mail Merge on Outlook 2007, 2010 and 2013:
To change your account for Mail Merge on Outlook 2007, 2010 and 2013, follow these steps: Open Outlook up. 2. Access File = & gt; Account Settings
3. On the Account Settings page, at Email tab - Select the account you want to use for Mail Merge (such as user22@repairwin.com).
- Click Select Đặt là mặc định
4. Next, select Data Files tab - Here select the .PST data file that matches the email address you selected at the Email tab (such as user22@example.com.pst).
- Click Select Set as Default , skip the warning window.
5. Close the window Email Account Properties again. Get started back to Outlook. 7. Once done do not forget to transfer default account and Data File default about the initial state. Good luck! 
