I may have taken your question to the wrong context. I apologize for that. I am not sure about the Outlook app, but if you really want to synchronize reminders on both PC and Mobile, you can use Cortana. You do not need to install Cortana on your pc because it is already built in. You just have to install it on your Android mobile and enable notifications for your Microsoft Account.Which app manages reminders and alarms in Windows 10 ?