Hi! I agree that the message Yahoo sent out was not very well thought out, I just went to Yahoo and checked it out. It says that the Briefcase feature will indeed be phased out in March.
While you're in your Yahoo e-mail account, in the upper lefthand corner click on Yahoo and it will bring up a list of Yahoo Services on the left side of your screen. If you click "See More Services" (or something along those lines) at the bottom of that list, it will bring up an alphabetized list of all Yahoo services available. Click on Briefcase and you'll see the same announcement in the e-mail with the link that we received.