For Microsoft 365 E-mail Instructions, please see below.
Set Up OU email in Outlook Desktop for Windows
Set Up Microsoft 365 in Outlook Microsoft 365 for Mac
Set up Microsoft 365 in Apple Mail Client for Mac
Set up Microsoft 365 and Mail on Your iOS Device (iPhone and iPad)
Set up Microsoft 365 and Mail on Your Android Device
POP/IMAP/SMTP Email Settings for Microsoft 365
Accessing your OU E-mail via the Web