What do you gain from upgrading NHibernate 1.2?

Question

I have one project using NHibernate 1.2. I know it\'s old, but I\'ve used it since I\'m working off NHibernate in Action, which targets that same version.

I\'ve been

Answer 1

James Kovacs summarized it pretty well, but for a complete list of changes check https://nhibernate.svn.sourceforge.net/svnroot/nhibernate/trunk/nhibernate/releasenotes.txt

It contains every single bug/improvement/new feature for all NH releases.