― Last couple of weeks ago one of my friends got this problem. He has account in yahoo mail, currently he has switched from classic to new one. In the new yahoo mail service there is not column of the size; the user can’t see the size of the message in the Inbox. Even I searched a lot. Finally, come to the solution. If user wants to see column of the size he has switched back in the old version. Or follow the simple steps. ∙ Step By Step ∙ 1. Login to yahoo mail2. [...].