SBS2003 CALs

We are just moving out of our original 5 cals and im a bit confused as to how these things work. Right now we have about 10 people connecting on and off 5 of them are here in the office and the rest are contractors or field workers. My confusion comes from reading device v. user cal desciptions. I know we have more than 5 people connected at points. For instance i just got an email from one of my contractors from OWA and we have 5 people in the office. So what does that mean? BTW i got the popup about CALS on the sbs03 login screen when she logged in.

What kind of liscences should i be looking for here? We just hired 2 new office and 1 new field person, and i know we are about to hire 2 – 3 more contractors.