When Yahoo released its own mail app on the market I gave it a try. I have been using the native mail app. It worked fine but thought the one from Yahoo might add something to the experience. Initially it was ok. Nothing spectacular. I could access all of my folders that I couldn't do in the mail app. but otherwise it was just the same. I continued to use it though. I noticed a difference in my battery life but I added several apps during that time. It got so bad that I was charging at night and again during the day just to keep my phone alive. I uninstalled the Yahoo app and my battery went back to lasting a full day and still having charge on it when I plugged in at night the next day. I have not read of anyone else having this issue but thought I would pass my experience along.