You seem to misunderstand my post. Stage 1 requires admin's involvement. You are looking at stage 2.

Yes, you can access his email account on your computer, just add another email account in Outlook. (Tools -> Email Accounts -> Add a new e-mail account). If you also receive emails with this new account, you have to be careful - make sure you check the option "Leave a copy of message on the server", also check this option on his computer.

Please note that, you have two options to receive these emails:

Option 1. You setup his email account on your computer, since both of you access the same account, you have to make sure the emails remain on the server after one of you receive them.

Option 2. He forwards his emails to your own email account.

Overall, option 1 is for you.

Hope I make it a bit clearer, I find it's hard to explain this scenario.