Customer Experience Improvement Program (CEIP): By default, these systems may ask to participate in CEIP. If enabled, the OS sends anonymous data about how you use the installation interface and any errors encountered.
Windows 8.1 and Server 2012 R2 introduced several features that require an internet connection and, consequently, data sharing. These include:
Explain the differences in (Retail vs. Volume).
Error Reporting: If the installation fails, a "minidump" or error log may be sent to Microsoft to help diagnose the issue. This log contains technical details about the system state at the time of the crash. Managing Privacy During Setup