If you’ve managed to get the documents back then more than likely the emails are safe. If I remember correctly OE emails are stored in a file with the PBX or dbx file extention, what you will need to do is find where the pbx for the old user account is stored and then import it into the new users accounts oe account.
normally the file is stored in the C:\Documents and Settings\<User>\Local Settings\Application Data\Identities”long number here”\Microsoft\Outlook Express
location, just browse to it from within outlook express and import the files that exist there.
You might need to change your view to include hidden folders (cant remember if 2000 does that or not), on xp its in the windows explorer then tools/folder options/view