7
I agree with you, which is why I'm not really recommending it. It's too bizarre and long winded to explain my own circumstances for doing it, but suffice to say my users are re-registering from one style of registration to another, but until everyone has re-registered new accounts I need both sets of user accounts to be valid. Once all the new one's are all done, the old accounts will be deleted and the e-mail duplicate check returned back to false, i.e. 0. And then, like you say, the 'Lost Password' feature should work fine.
Ted