^^wait for some time, i am sure someone will answer your question,the reason for late response is that everyone doesnt know about this particular scenario(myself included).
I dont think there is an Outlook express 2007. But I have upgraded from Outlook express to MS Outlook 2007. I hope you need to install "Windows Mail" first to import the DBX Files and then you have to export from Windows mail to Outlook 2007 easily.