Currently I am running a wordpress MU site with ~100 blogs. It's Wordpress MU version 2.8.x
Because it was so heavily used, I was asked not to update to Wordpress 3 right away. The users are worried that their plugins and themes may not work once I've upgraded. Indeed, we activated some plugins that I suspect will stop working because there have not been any updates to them in a while.
Other users are anxious to start using Wordpress 3 and the new features.
So, what I have to do now is somehow test what the update will look like, and let users log in to test how their site will look in Wordpress 3.
My question is, what is the best way for me to test the upgrade?
My the root of my Wordpress MU is at mydomain.com, and the sites are in the directory below, such as mydomain.com/henrys-blog
Thanks for your help