Outlook Express never died. It was renamed to Windows Mail and now to
Windows Live Mail.
I personally like WLM 2009 (version 14 or the "XP" version) the best and that's what I upgraded to when I finally transitioned from XP to Windows 7. It also works great in Windows 8.1, which is what I currently use. It's a lot like OE, and having been a long-time OE user, the transition was painless.
The newer versions of WLM ripped out the old editing component and replaced it with one made using .NET (the same as the one used in Writer), but in the process, it made an unforgivable regression: losing the insertion of ">" in plain-text quotes. The newer versions also have a ribbon interface (which may either be a pro or con depending on your preferences).
Oh, and if you do decide to go with WLM 2009 instead of a newer version, and don't care about the other Windows Live stuff, you can do a standalone install of Mail using its MSI file, which is a much lighter, cleaner install (this isn't possible with the newer versions because there are a lot more interdependencies). And also a much smaller download.
MSI installers for WLM 2009 (for standalone installation of just Mail with no other Windows Live bits):
Mail: http://wl.dlservice.microsoft.com/d...35-4250-9598-AEE5D854A7EA/en/Mail-ship-en.cab (13MB)
Address Book: http://wl.dlservice.microsoft.com/d...598-AEE5D854A7EA/en/Contacts-ship-neutral.cab (0.9MB)
These are direct download links from Microsoft's server. You need
both MSIs, which can be installed in any order.