Apple hopes it just works
Microsoft's Windows Vista, the follow-on to Windows XP, created a huge panic in the enterprise when it was introduced back in 2007. Users couldn't understand the logic or reasoning behind the design changes. By contrast, people switching from Lion to Mountain Lion will suffer no such trauma.
Mountain Lion is not revolutionary. As with its iOS mobile operating system, Apple is content to introduce carefully engineered and designed evolutionary changes. Upgrading to Mountain Lion will be similar to upgrading from Leopard to Snow Leopard.
Though it might not sound exciting, Apple's approach to desktop upgrades does guarantee a smooth experience for users. And users' perception that "it just works" is more important than ever as Apple makes a push for the enterprise.