Windows 10 was criticized on-launch for having default settings that send various information regarding user behaviors to Microsoft and its "trusted partners", such as data regarding user contacts and calendar events (to optimize text and speech input), location data and history, "telemetry" (diagnostics data that is used by Microsoft to help service and optimize the operating system; this could not be fully disabled on non-enterprise versions of Windows 10), an "advertising ID", as well as further data when the Cortana assistant is enabled in full.