Although you can't get Outlook Express to work on Windows 7 you could get Windows mail (from Vista) to run). But why bother install Thunderbird instead if you don't like the idea of your e-mails stored on the web.
if you don't like the idea of your e-mails stored on the web.
All e-mail clients (including Thunderbird) have options to save copies of messages on mail servers - or not.
Your choice. But if you like to sync email between multiple devices (PC, laptop, tablet for example) it sure is handy.