If we install and configure the 120 eval version and then wan to go ahead with the "full" version, can we just upgrade to it, or do we have to reinstall and configure it again from scratch?
ISA 120 days trial has different build than full version. (3.0.1200.0 – 120 days trial and 3.0.1200.50 - full) so i guess it would be better to reinstall. AD structure has no difference. generally it's not a problem - conf. backup/restore is simple.