When you need to connect using an email client that does not support Exchange use IMAP to keep email in sync and use POP3 to download emails to a backup server.
IMAP Settings | POP Settings | SMTP Settings |
Server: outlook.office365.com Port: 993 Encryption: SSL/TLS Username: (email address) Password: (password) | Server: outlook.office365.com Port: 995 Encryption: SSL/TLS Username: (email address) Password: (password) | Server: smtp.office365.com Port: 587 Encryption: STARTTLS Username: (email address) Password: (password) |