Are you sure about their mail and weather services being of any use whatsoever?
I have a yahoo mail account and every time they update it they somehow manage to remove any remaining useful features and make it harder to use and just more stupid. It also tends to fail on more browsers and devices and they intentionally cripple the "old" version by making it as useless as possible while still nominally keeping it the same.
As for yahoo weather, I gave up looking at that even purely for laughs a long time ago. It seemed to have some form of time-displacement problem where the weather it forecast and reported often seemed to have no correlation to actual weather or what was being forecast by other services. Just to be fair and reasonable I have just checked the yahoo weather for where I am now. A mere difference of 3 degrees in the current temperature (vs met office / bbc weather) and the 5 day forecast bears little relation to the met office / bbc weather forecast. Also in typical dumb-US style (the US is one of the three remaining countries on the planet to not use metric measurements), the mouse over tips only give information in Fahrenheit and not the selected / default temperature units elsewhere on the page.