Having done this recently, no problems losing anything. All looks pretty much the same.
Having had problems with my e browser, I tossed a coin and switched over to Giggle Chrome recently. When I tried to open Yahoo Mail they sort of frog-marched me into the 'newer' version of Yahoo Mail, making the whole thing close to painless. And all these years I had been putting it off!
Just one person's opinion. I would wait for a couple more before taking the final death-defying leap!
