This is the best way I have found. It allows you to
simply double click on the stored message and it will
open (providing you have Outlook open). Open Windows
Explorer, create a folder on your C: (or H: if networked)
(eg) emails - then resize Windows Explorer and Outlook so
both fit on the desktop and simply drag and drop your
mail messages to this folder/folders. Test that this
works then delete mail from Outlook. This way you don't
have to fiddle with export/import from an archive file.