You mention accessing e-mail from IE, but you imported mail info into Outlook Express. IE and OE are two standalone programs, and they have to be treated that way. Any reason why you did what you did? I don't understand what you were trying to do.
Just for your information, Mozilla Firefox1.5.0.4 is equivalent to IE, as a browser, and Mozilla Thunderbird1.5.0.4 is equivalent to Outlook Express for mail. You can import your settings to Firefox, as you set it up. The same is true for Thunderbird for Mail, although I always set up my account first, and then copy/pasted the mail folders.
I reread your post, and I think that I understand what you are saying. You had OE mail, and imported your mail into Netscape7.2. Am I correct? Did you set up your account in NS7.2 mail?
If you are looking for your mail imported from OE, it is, probably, in the Local Folders, as a folder of Imported fromm OE folder, and subfolders.
If you find it there you can move the folder to your mail account, so that it is more readily available.
Confirm what you see.
UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.4) Gecko/20060508 Fireraptor Firefox/1.5.0.4