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Very simple and easy to use with few steps, and it's free!!!.
I loved its simplicity! I used it to open up Yahoo Email that I backed up offline. All I had to do was click on the folder with my emails and hover it over the Mail Viewer Icon on the desktop. From there my emails were easily viewed, and I only had to do that the one time. From then, whenever I downloaded emails offline, they opened up just like the first bunch.