Setup Office365 email accounts in Apple Mail or "other" email clients.

Office365 supports IMAP / SMTP

This means you don't have to use Office365's webmail interface! You can check your email and send messages using other email programs (like Mailspring, Outlook Express, Apple Mail, or Mozilla Thunderbird). Using desktop email applications can improve your workflow. They typically offer more options, and your email is still available on your computer when you're disconnected from the internet.

Setup Your Office365 Account with Your Email Program Using IMAP

To access your Office365 email account from a desktop email program, you'll need the IMAP and SMTP settings below:

Office365 IMAP Server
IMAP port 993
IMAP security SSL / TLS
IMAP username Your full email address
IMAP password Your Office365 password
Office365 SMTP Server
SMTP port 587
SMTP username Your full email address
SMTP password Your Office365 password