Hi,
I'm finding myself in the position of updating a very old installation of MediaWiki, even if I'm far from a specialist in that sort of things.
It's a 2007's 1.9.2 MediaWiki, on a MySQL 4.0 version. The only serious extension was Semantic, but not overly used. The content is mostly French, with a sprinkle of Polish. I need to update it to the last MediaWiki and a somewhat recent MySQL & PHP version.
I was wondering if the list experts had any tips, traps to look for, well any advices on how to approach such a task?