I've had a severe fracture of my mail WLM12 store folder in my old W7Pro machine, source of some prior threads.  That drive is now out of my new machine.

I also have an intact set of much of that from the previous XP machine, in Outlook Express, in an external drive, ending in April 2015.

Both of those have many subfolders, and pull mail from 4 accounts, each having a separate 'inbox' with the account name.  I'd very much like to be able to keep all that information.  I have an all-mail folder which has all incoming mail, each one bearing the account name in the appropriate column.  I'd very much like to keep that information (name of account to which a mail is directed in a column on the inbox).

And, during the construction/repair of my previous computer (new PSU and MOBO) which had the first instance above, I've been using my W10 laptop's WLM.  In it I have only my personal account downloaded/ing (because the info is critical, I'd keep using the laptop until the new computer's mail is built).

My computer is now rebuilt, with a fresh load of W7Pro, but nothing else.  I'll have to download most of my programs that I use, but I'll accomplish that over whatever time it takes, in order of importance.  My number one important item will be the assembly of my email as I'm in the middle of an important project.

How can I put all that into the new Windows Essentials download result of a new WLM12?  

What should (or shouldn't) I do to the new, blank, program in setup to ready it for the most effective import/transfer?  (Items which come to mind include configuring the 4 with the proper name, to match those coming from the first two instances, for the 4 accounts and populating all the sign-in and outgo mail info.)