Question: We have had issues with Mootools not being very backward compatible specifically in the area of drag and drop functionality. I was wondering if anyone has had any similar problems with jQuery not being backward compatible. We are starting to use it quite heavily and are thinking about upgrading to a newer version to start using several plugins that require it. Will we have any issues if we get rid of the older version?

Answer: 
jQuery seems to be nicely backward compatible. I have been using it for more than a couple of years now through several versions of the core and have not had issues when upgrading except a few minor ones with some plugins. I would say that the core seems to be fine but if you're using a lot of plugins you might run into some problems (but these are usually easy to fix, or the new core has that functionality built in anyway so you can just drop them).
*My experience* is that when upgrading, I sometimes find that stuff that used to work breaks. For instance, when upgrading from 1.7.2 to 1.8.3 I found some drag-and-drop features stopped working. Some problems may be due to deprecated jQuery functions being dropped, still in use by incompatible versions of [jQuery UI](http://jqueryui.com/).

Here is a [quote from another user](http://sympmarc.com/2011/06/27/jquery-and-backward-compatibility): 

> 
> Backward compatibility may not be the jQuery team’s strong suit, but
>  as with most things, it’s a work in progress. I’m not meaning to
>  disparage the great work they do, but it points out the fact that you
>  simply *must* always test your scripts with new versions of jQuery. 
> 
> 
>