Is there really any need for this?<p>Maybe I'm a little traditional but last time I checked Microsoft handled this just fine on their own, is Yahoo Mail really in such a bad place that they need to outsource their file attachment hosting?<p>When I'm using outlook, I click on a file once and it downloads, simple as that, I don't want to have to screw around signing up for yet another service just to use it.<p>I don't really care how amazing Dropbox may be, if I have to screw around accessing another service instead of just clicking "download attachment" then the user experience is already ruined for me.