Have a look in the admin guide of a supported version that you'd want to run. The next issue you will have is getting your hands on current versions. Cisco used to be pretty good about leaving documentation published for deprecated versions, but no...
Welcome to Cisco naming, but don't worry, soon the only word that they will ever use will be 'Webex'. The key differentiator in the link I sent was 'Express'. We've all missed details before, but in this field details are extremely important and my ...