Possibly
If you're lucky, it's just looking in the wrong place for the local folders. If not, it's over-written them
Do you know where they used to live ? If so, go there and see if the old ones still exist, then back them up, then poke about in the T-Bird settings to point it at them. It might at this stage make new new local folders in the new location, which is why you must back the old ones up first. If it does that you can replace the new new ones with the old ones.