Back in April I wrote an article entitled The Great Plugin Backwards Compatibility Debate, in which I referred to some data showing that a considerable proportion of WordPress users have not installed the latest version (or even the previous latest version, or others before that).
Those figures will be somewhat skewed by inactive sites and the like, but I don’t think anyone could dispute that there are (and probably always will be) a proportion of WordPress users who choose not to upgrade to the latest version of the software.
But why? I would say that there are three common “fears” associated with upgrading:


