Hey Kichae, I had all my credentials for my old account. I tried logging in with them, but nothing was happening. I put in the wrong password and then it told me that I had an invalid password, which essentially told me it was there.
After screwing around a bit and trying to just make a temporary account (which never happened because it never sent me an activation email for some reason), I finally just made a new account with my old credentials. It told me that I had activated a legacy account and that I needed to respond to an email, which actually arrived this time.
So maybe give that a try...don't know how much of the old account you need to match for it to recognize that it is a legacy account though.
Of course I don't know if it actually imported anything