Ok, I did get this back, so it is not a complete disaster. The file you are looking for is /home/e-smith/accounts. Be careful, back it up before you change anything, etc, etc.
You are looking at where e-smith keeps a record of all the accounts. There are loads of system accounts, like qmail, squid, all that sort of thing. Leave them alone. The lines you are looking for look like this:
devans=existing|Gid|5001|Uid|5001
Now, go into the server manager and create an account that does not already exist (I used test). A line will be added to your accounts file, like this:
test=user|EmailForward|local|Gid|5002|City|test city|ForwardAddress||FirstName|test fname|PasswordSet|Yes|Phone|555-1212|Uid|5002|Street|Test|Company|test company|Dept|test|LastName|Test
Now you have to change all the "existing" users into this format, changing the Gid and Uid numbers for each line, and setting their names and address correctly. I had about 70 users, so it took me a couple of hours.
Now you have to do the same for Ibays and Groups (create temp ones, copy format to existing lines).
Oh, and you should also tattoo "Never do a post-install" on your knuckles, so you can see it when you are typing. I have.