Transfer Windows Live Mail 2012 storage folders on older PC to WLM 2012 on a new PC

I purchased a new PC and was able to install WLM 2012 on it, and all my contacts and calendar entries transferred over just fine. However, I cannot find a way to transfer all of the Storage Folders (and the email messages that were there) from the old PC to the new one. I was told by Dell support to look for the ".pst" file on the old PC, and to copy it onto a flash drive and transfer that file to the new PC desktop. I am not able to locate any file that shows as a .pst file - and have even read some comments that WLM 2012 does not contain a .pst file. Can anyone tell me where mail that was in the storage folders is located? I can see the actual storage folders within the Microsoft/WindowsLiveMail/Storage folders in the AppData/Local file location - but the messages are not there. And while I can see the folders listed in that file location, they do not show up when I open Windows Live Mail in the new PC. They still appear on the old PC, and I can access them there.