to be clear, you can record your greetings in any language you want...
We're only talking about three call handlers here - the opening greeting, say goodbye and the operator call handler here. Completely uninstalling the entire system just to get the default install greetings in French for those seems rather extreme to me.
Most sites record the opening greeting and operator handler greetings for themselves - why don't you just do that?
If you really want the default install greetings for those in French instead, you can just fish the WAV files for those off the install media and paste them into the greetings on the call handlers manually - it'll take you a couple minutes at most as opposed to hours to do a full reinstall.
the default install opening greeting call handler greetings are found on the language CD in question under \commserver\localize\DefaultConfiguration\FRA\
You'll see a number of .WAV files in there, the ones you want are all named "openinggreetingXXX.WAV" - you'll see the day (standard), closed (off hours), busy etc... there - same for the operator call handler. You can go to the respective install created handler in question and use the media master control to "paste from file" and select the appropriate wav file - this should get you what you want.
