When you first open Outlook 2016, you should be greeted with this page:

Enter your enumber@uos.ac.uk into the box, as shown below:

It should then prompt you to choose an account type, please select “Office 365”:

Once selected, you will see this screen for a short while:

A credential box will then pop up, where you need to enter your University password and tick the “Remember my credentials” box:

After clicking “OK”, you should see confirmation screen to confirm setup is complete. Click “OK” again:

This will then open your mailbox, but you may find it takes a while for your mail to appear, as it will be downloading from the mail server