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Microsoft Word's mail merge normally sends emails from the default Outlook email account that is setup in a user's Outlook profile. This article assists our users that are members of a shared mailbox with setting up their default email in Outlook before sending a mail merge from a shared mailbox instead of their individual, Tarleton email account.
Ensure the Shared Mailbox is Added to Outlook
Please see the Tarleton OITS Knowledge Base Article How To: Add a Shared Mailbox to Outlook to complete this step first before moving onto the next section below.
Set the Shared Mailbox/Email Account as the Default Email to Send As
Step 1: Click "File" on the top toolbar/navigation bar in your Outlook.
Step 2: Click on "Options" in the bottom, left-hand corner of the selection window.
Step 3: In the pop-up window, select "Mail" and then scroll down to the "Send Messages" section. Click the check box next to "Always use the default account when composing new messages" to ensure that it is selected. Then click "OK" to save your changes.
Step 4: Click "File" on the top toolbar/navigation bar in your Outlook again.
Step 5: Click "Account Settings" and select "Account Settings" again from the drop down menu that appears.
Step 6: Under the "Email" tab, select/highlight the shared mailbox/email address from the list of available emails, then select the "Set as Default" option. 
Step 7: Under the "Data Files" tab, select/highlight the shared mailbox/email address from the list of available emails, then select the "Set as Default" option as well. Then select "Close."
Step 8: Proceed to send the mail merge through Microsoft Word. After sending the mail merge successfully, please revert the default mailbox settings back to the user's individual, Tarleton account as shown in Steps 6 & 7 so any future emails can be sent through the user's regular Tarleton email address again.