Also, the 2.0 story had slight changes in dialouge for legacy players. Basically, they aknowledged that you played through the 1.x story (like characters recognizing you, references to your former deeds, etc.) but since the 2.0 story is entirely different and takes place 5 years later, you still have to do everything from the start, just like everyone else
The only difference is that your level is (probably) already 50, so you just have to do the new jobquests (which are pretty much the same as before though) instead of leveling up again.