Pl. help : re. Migration , moving data : Reformatted machine : Old mail directories backed up :

Hi

I use win XP and Mozilla 1.7.13  (I've downloaded and installed this 
just now)

A few days ago, I had to reformat my machine + re install windows etc. 
(AFTER safely copying Moz mail and bookmarks)

I had five different pop3 accounts i.e. 5 different profiles on my 
earlier win XP machine . As far as I can see all important mail have 
been backed up - so loss of mail or data is NOT an issue, just migration is

I need to move the mail (from my old backups) to Mozilla 1.7.13 that I 
have just now installed

any advise, pointers, tip are most welcome

As of now I have used JUST this NEWS CLIENT and browser and taken care 
NOT to start mozilla mail

some other notes
-------------------------
1. As of now I do NOT wish to move out of Mozilla
2. As of now I cannot move out of win XP
3. Pl pardon the cross posts. 'am forced to do this, to seek an early reply

thanks in advance for your time and efforts
regards
V