My first experience with Rails was inheriting a rails 2.3 application. It was never ported to 3.x, and limped along for a good 4 years in maintenance mode befor

My first experience with Rails was inheriting a rails 2.3 application. It was never ported to 3.x, and limped along for a good 4 years in maintenance mode before being replaced by a Java app. But sure, upgrading apps from 3.x up through current is pretty trivial.