Saving emails to hard drive from Outlook

[AJJ65]

John,

I have copied a bunch of emails from Outlook 2010 to an external hard drive.

I now want to bring those emails (.msg) to Outlook folders on another computer using Outlook 2013.

If I drag and drop the into the Outlook 2013 folders, they show up as .msg files sitting in the folder and do not appear or sort as 'emails.'

If I open the individual messages, I can then 'copy' them to that or another Outlook folder.

When I do this, it somehow magically coverts them to a normal 'email' file and not a .msg file.

This would be fine if I needed to input a few email, however, I need to bring in thousands of emails.

How can I go from .msg to normal email quickly?