When using mail merge functions in Word to send emails, Outlook will use the default email as the sender for the emails. These instructions show how to temporarily change that setting to send emails from a shared mailbox account, not the individual email account. *Note: You need to have permission to send from the shared mailbox.
Step 1: Adding the shared mailbox to desktop Outlook
- Open Outlook
- Click File on the top left
- Click + Add Account
- Enter the shared email address in the email address box.
- Click the V next to Advanced options to reveal the check box for Let me set up my account manually
- Click the check box for Let me set up my account manually

- Click the Connect button
- On the next screen select Microsoft 365

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