Thanks for the reply.
All of my TurboTax activity has been via the online application. I've only used this one, same email address to login every time, and the TT phone reps (x2) confirmed that there weren't any other IDs/accounts associated with that email.
Just now, I tried to use the account-recovery link that you posted, and I chose the verify option which takes longer... so, when submitting that form just now, TurboTax then posted a message: "There's a problem on our end."
Not sure how to proceed, except to just try waiting a bit and then swallow this huge pill and "start over." Phone support has been polite, but unhelpful, and there doesn't seem to be any other avenue to pursue a solution.
