Outlook PST Multiple Subfolders - Extract All Messages to One Folder at Once

Hierarchy of folders in Archive not necessary.

Need to extract all messages to one directory.

Any way to do this in a batch?  Rather than extracting them to the identical file structure, or selecting one by one each subfolder to go to a new single destination, run command that takes all mails out of every nested folder and dumps them into one folder in the new destination.

Thanks!

OT