Just migrating this site's Mambo section (there are also some "regular" pages, made w Dreamweaver) to Joomla! cms.
I'd migrated an earlier site, following instructions at: Migrating">http://help.joomla.org/content/view/818/132/]Migrating to Joomla! from Mambo - there, supposed to create a new folder with Joomla!, test if that worked, then move files over to where had the Mambo installation. But when I tried this, my Mambo site stopped working.
So this time, to save some time, just over-wrote Mambo files via ftp. - as my host server not lightning fast, I did this folder by folder: so, "dropped" contents of administrator, say, into my Mambo administrator. This way - it seems! (not yet checked everything) - replaced files and folders; but also, retained files and folders that are additional to Mambo/Joomla!, such as extra components, modules, images etc etc.
(Working the recommended way, would have to copy these files and folders over to Joomla install, which I found a bit of a pain during previous migration.)
Was a hiccough when went to administrator: log-in page was for Mambo, and the admin pages were mostly blank. But, the instructions told of a file to convert SQL database from Mambo to Joomla!, and said this was needed for administrator to work. I opened this file (in a text editor), and via phpmyadmin ran this as an SQL "query" - after which, administration looks ok.
Right, now to do some more re migration: need security changes, such as turning off regisiter globals. Also, this forum to switch from Simpleboard to Joomlaboard - so removing an auto spam posting problem that's hit me at times. And, aim to move from Gallery 1.5 to Gallery 2.