How to read "eml" extensions

I have not used a Microsoft account for my emails for a few years now because of the problems caused when changing my ISP. However I have been able to read my old Outlook emails as Outlook was included in the OS. WIth Vista and the new Microsoft 7 there is no email program, can I get a program that will enable me to read these old emails. I cannot even see Windows Mail which I think existed with Vista.

The reason I ask is because I have a business course that came by email (Outlook) and each lesson has an eml extension. I wish to refresh my memory on certain points so need to look at this course.
Hope someone can help. I use gmail now.

Thanks

 

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