Outlook will now use whatever is marked as the default email as the sending email address on a mail merge. Restart Outlook for this change to take effect. Highlight the profile that you want, access Set the default profile Manage profiles or identities in Outlook for Mac
You can create a second identity (profile) in Outlook on Mac and use that for the mail merge - but you need the correct permissions on the mailbox. Mail merges will always use the default account in your profile.
I want to change the sender's email address for mail merge in Outlook.
