The nice thing about extensions, in comparison to the way modifications work for software like phpBB, is that they're pretty easy to remove: You just take a line out of LocalSettings.php, and it's gone. Of course, if it's something that affects pages in a lasting manner, then it could be messy...which extension are you looking at? If you're worried about compatibility, then I would recommend you look at the version the extension is marked as being compatible with. If it's several versions back, then look and see if the author is active on the site, and if not, see if you can email him or her. If you can't get in contact with the author, then see if there are any other versions of the extension available that are being actively maintained. If not, then you could think about asking an experienced extension writer if he or she would be willing to help you in the event that an upgrade breaks something. (It probably pays to get someone in advance as a contingency, and it's doubly important to make backups so that you can revert an upgrade if it messes things up.) On 2/6/07, Fernando Correia <fernandoacorreia(a)gmail.com> wrote: -- Emufarmers Sangly Pirate, Cowboy, Hellraiser