Yes, there is a solution (kind of). The only possibility to "transfer" my OLEX 6 messages was to install Windows Live Mail 2012. Actually, I installed only a MAIL part of it (plus some extra part that I was not able to uncheck during custom installation of the Windows Essentials 2012 package, to avoid having more useless apps installed).
Windows Live Mail 2012 is similar to Outlook Express 6 (sort of), but even I finally did a "transformation" approx. 3 weeks ago, I am still frustrating.
WLM 2012 was not able to import my folders with messages (from OLEX backup) as I expected.
First, everything was thrown inside the STORAGE FOLDER, and I should rebuild the whole folder/tree structure for all my POP3 accounts, move messages, .... (I have 6 of them right now). WML does not support drag and drop feature to move folders (only for messages).
Secondly, WLM 2012 is not even able to import all my messages from my OLEX6 backup. For example, on the first try, only messages dated before Jul 2010 were imported into my Sent messages folder (under Storage Folder, aka Archive). After deleting all messages in that folder, I attempted importing messages for that folder again hoping to be done correctly on the second try. It went up to Aug 2011 (no sent messages imported after that!!!, while I had thousands of them in backup).
I did backups & import/export tens of times under XP and Vista, and I never had a problem as I had with WLM 2012 under Windows 8. As of today, I am not even done with a transition to WLM 2012. So much for claimed compatibility and ease of use !!!! (as claimed by MS in misleading info provided on its support website).
I plan to keep it as a temporary solution (I bought a new laptop because of the speed for video editing), and I do not have time or desire to learn and look for all hidden/misplaced/removed features in Windows 8 (features that I used to find and use with ease before, either in XP or Vista PCs; features that I cannot find easily in Windows 8 without performing online search for tutorial).
I am fed up with Windows 8; I plan to continue using XP as long as possible/supported, and switch to Linux (Ubuntu, Linux Mint ... still not decided) and move to Thunderbird or Evolution as my mail client program. They have more features that I might need, and it will require more work to do when making a transition, but I know what to expect (based on their great step-by-step tutorials with screenshots). I never wanted to go that way (Thunderbird), but I am not willing to invest my time in rebuilding everything in WLM 2012 to find out that after couple year MS decides to do some anti-user decision again, and I will have to do everything again into another questionable WLM mail client. It's more practical to switch to Thunderbird now.
Being fooled by MS's statement: You could reinstall the app and transfer your email and address book, .... (first paragraph of my post), I was not able to find one tutorial -- a step-by-step tutorial with screenshots explaining how to reinstall Outlook Express 6 under Windows 8 and import messages.
I noticed that MS removed misleading statement (as quoted in my first post) after my numerous negative feedback submitted, but it's clear that MS cannot provide tutorials for previous OLEX 6 users, because they know that it is not possible. MS wants us to abandon our POP3 accounts and re-route all our mails to their server/cloud or pay us for Outlook 2013 or as a part of Office 365 subscription or Office suite to have a "luxury" of the easy use and import/export of OLEX 6. Ain't gonna happen!!!