Originally Posted by birdy

Do you mean that you've forgotten the email address, or that you don't use it anymore? It doesn't matter if it's not your current email address...just enter it on this page
Lime Wire » LimeWire PRO Lookup

If your Pro's out of date, or if you didn't buy from the official site Lime Wire » Official Website & Free Download, BitTorrent « then your email address won't be in the database anyway