Not sure about 11, but 2003 and 2008 were very lax with CALs. You may want to try wit the CALS that come with it and see if you have issues with the others. Of course, it isn't really legal. I'm just sayin'
It's pretty lax too. No enforcement. I thought SBS 2003/Server 2003 was pretty strict with CALs. I remember CAL enforcement on those. Server 2008+ has no CAL enforcement.