Office 2003 licensing question

I have a small network that has Office 2003 (SBE) installed on the 5 workstations – 3 desktops and 2 laptops. The network was set up with 5 user licenses. However I’m now replacing the laptops with 2 new desktops and I’m not sure what I need to do to be compliant with my license… if I replace SBE with Open Office on the laptops (now for use at home by my kids) will I simply be able to install SBE on the new desktops?

Any thoughts?