I tried the new Yahoo! Mail (or beta) when it was first launched. As a frequent user, I was excited to see what they had come up with. I was very disappointed. I am not a fan of the Outlook-like interface. I felt like I was reading my mail through a porthole. But it supports a non-preview mode, which is cool. The interface felt heavy and slow and it inflated my browser memory usage. I switched back to the old interface and have never looked back.