Regardless of how much testing you do, apps may still crash when they are installed on user devices due to special configurations or any other reason.
It's vital that when it happens, you are not in the dark, so you get a chance to fix it for the next version.
HockeyApp is a beta distribution and crash reporting platform from Microsoft. Through HockeyApp, you can easily distribute new versions of your beta software to the stakeholders and testers who need to have it on their devices. Learn more about HockeyApp.