I have successfully installed Outlook Express in Windows 7 XP-mode.
The problem is that when I enter the passwords for the email accounts they are not being retained over logout/login cycles. The passwords will be recognized and passed on while the Outlook Express session in which I set them is active, but once closed they are not retained. Since I have several emails, with complex passwords, reentering them is not a reasonable option.
Any others seeing this problem, is there a fix?