If a user has access to joint or shared mailboxes and would like to send a email as that account, they may do so from the Outlook desktop application by doing the following
1). Select 'new email'
2). Go to the 'options' tab
3). Enable 'Form' in the 'Show Fields' section
*A from drop down menu will appear next to the name of the sender
4). Select the drop down and pick the address you wish to send from, if it isn't on the list select 'other email address' and search.
Reviewed: 8/12/2019, 4/5/2023