This is just a workaround app for a bug in Android 4.1 (alias Jelly Bean). See http://code.google.com/p/android/issues/detail?id\u003d34880 for details. Info for Samsung users: at present you\u0027ll need this app too, see http://developer.samsung.com/forum/board/thread/view.do?boardName\u003dGeneralB\u0026messageId\u003d232748 Under Android 4.4.2 it\u0027s recommended to install this app as well. There is a new issue in Android that causes accounts to be removed during an app update, see http://code.google.com/p/android/issues/detail?id\u003d66905 The bug causes accounts of paid apps to be removed when Android boots up. To work around this issue this app pretends to provide the same account type that CalDAV-Sync provides. That\u0027s enough to convince Jelly Bean to keep the account. That\u0027s all this app does. Please open the app at lease once from within Google Play to \"enable\" the workaround. It may not work properly otherwise. On some devices you\u0027ll have to install this app before you install CalDAV-Sync. Please try that if you still have problems. Please note that the bug is in Android 4.1, not in CalDAV-Sync! If you\u0027re not using CalDAV-Sync on Jelly Bean, you don\u0027t need this app. There is no need to give it a bad rating in that case! Please don\u0027t install it in that case.