I just started a new job internally at work. I am attempting to be able to
look at my boss' calendar in Outlook, however, it doesnt allow me to because
I get a pop up screen that says that the other user doesnt have a mailbox on
the server.

We share an office and I know that he has a mailbox on our company's server.
I have a regular office PC where he uses a laptop with a monitor on his desk.
I would like to see his calendar given that we will have to visit customers
and various event places together. Any suggestions?

Also, how do I delete other calendars (from previous jobs) so tha tI only
see my boss' calendar only?