Hi, I have been using Incredimail since it more or less first appeared. In the early days I was a Beta tester for Incredimail. Of course I advise you to go for it, though I cannot guarantee that you will not have any problems. However, that said, most problems these days are more with the users PC's rather than with Incredimail itself. I personally have not had any Incredimail problems for the last few years - neither have any of my relatives and friends all happily using Incredimail.
Re Yahoo ... click here
I say use it and enjoy!