It's been posted, several times.
Some of the info got a little messed up. The immediately-linkable accounts (same contact info for both) were done very early. The ones that were more difficult require a request. For example, your original names probably didn't have a period at the end of it like your current one does.
There's a stratics email address you contact, sending your old account name and new one, and information that will link you to both, and they will import your old post totals, and get you access to many of your older posts for editing, etc.
One thing to do is check and see if your old name exists as "imported_(oldname)" If it does, it will be even easier for them to import. And, if you ask nicely, they'll even change any typoes in your screen name (like that period you probably didn't intend in it currently)