How to use a shared mailbox when Mail Merging in Outlook

First make sure this guide has been followed to add the shared mailbox to Outlook
Close down Outlook
Open Outlook - when prompted select the the profile you created from the previous guide (EG "Bursary" or "School Office). The one called "Outlook" is your personal Roedean email (EG XXX@roedean.co.uk)
In Outlook click "Send/Receive" the top and then click "Work Offline"
Process the mail merge so the emails are sitting in the outbox ready to be sent
Check the emails are ok are have mail merged correctly - then click "Work Offline" again and they will start to send