Every Windows product has a lifecycle and that lifecycle ends when it no longer receives security updates or fixes, software updates, and/or technical support. On Jan. 14, 2020 Microsoft will discontinue support for the Windows 7 Operating System. Without security, patches these systems will be easy targets for hackers, malware, and viruses.
Campus policy requires that devices connected to the network run software for which security patches are made available - and installed - in a timely fashion. After support ends, Windows 7 will no longer be in compliance with campus policy.
For additional details, please visit: https://security.berkeley.edu/news/microsoft-windows-7-end-life