How do I get Yahoo Mail on my Xperia X10?

[#1]

I just bought an Xperia, but I can't get my Yahoo Mail working. I try and set it up the same way I set up my Hotmail and Gmail, but it keeps saying my username and/or password is incorrect (it's not).

Any help would be appreciated!

[#2]

You can download Yahoo!Go from Android Market. Works fine for me...