To find the mail folder you'll need to change your folder options to 'show hidden files and folders'. You can do this by clicking 'organise' (found in the left hand corner when you open a window say to my computer) then click the 'view' tab along the top and you should then be able to tick the show hidden folders box.
After you've done the above , open your C drive (or which ever letter denotes your HDD) then click 'users' followed by your name and then 'app data'. Open the folder named 'local' and then 'Microsoft'. You now should have access to the mail folder which will contain your mails. You could copy them to disk and then transfer them over by placing them back into the corresponding folder in your new set-up.
Once you've...