I would like to install WordPress on a server that hosts about two dozen virtuals. I would like to install it in one place and then just "link" to this install from each customer's virtual. This way when I have to upgrade to the next version I only have to upgrade the files in one directory instead of in each installed directory and everyone gets updated at the same time.
I found WordPress-MU which allows for multiple users, but only under the same domain.
Is this possible to do? Any pointers on how to do it?
I'm running Apache on Linux if that helps.