Like all the other users of Wunderlist i had no choice but to switch. It took time to figure out how to be able to create lists without having to have due dates & reminders-shut them off in settings. I already had a Microsoft account which I used to sign into Wunderlist so I used it to automatically sign into To Do. That made it easy to import the Wunderlist lists to To Do {pop up at bottom}. I panicked at first but I was able to figure out how to use To Do in about an hour after installing it