Hi Jenny, just purchase a 5 License upgrade from someone like Action.com and you will receive a certificate which you store with the SBS license agreement and a floppy disk.
Just insert the disk on the server and run the setup and your done in about 10 seconds.
Jenny, I am not quite sure what you mean. When you purchase SBS 5 CAL you install it and it's setup to support 5 clients by default. If you then need it to support additional users, then you just purchase add-on license packs and install the floppy disk to upgrade the server, now the server will support the new amount of clients.
Thanks for the info. Yes I purchased another 5 user licence which I received in a email from Microsoft. It said in the email that they do not issue license certificates now - only email based ones. I think I should call MS and ask about the license disks.