A blog called Google Operating System has a quick tip on joining Yahoo! Mail Beta for free. Pretty quick and easy, all you need to do is change your content preference to Germany, France or UK:

…Then you will be asked if you want to join the beta when you log into your Yahoo Mail. Say yes, and join the beta. Then from the options menu, change your content preference what it was before…

Get Yahoo Mail Beta – [Google Operating System]

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