You can use the internet browser on your phone to log in to your AU email, which does not
store email on your phone, but allows you to view it, send emails, etc. It is the same as using O365 with a browser on your home computer.
The instructions are for an Android phone but the principles are the same if you use another type:
1) Open the internet browser on your phone
2) In the address bar, type outlook.office.com, then press Enter
3) Type in your full AU email address
4) Type in your Active Directory password (your O365 password)
Outlook will load, and you will be able to view your messages.
O365 is designed to display nicely on mobile devices, so you should not see a big difference between using your internet browser and your mail app.