On January 14, 2020, Microsoft is ending support for their Windows 7, Windows Server 2008, and Windows Server 2008 R2 operating systems. As are we.
After January 14, 2020, we will no longer support Windows 7, Windows Server 2008, and Windows Server 2008 R2 for Esri software. If you are still using Esri software on these operating systems, we highly recommend that you upgrade to Windows 10 or newer version of Windows Server, such as Windows Server 2016 or Windows Server 2019, before January 2020.
If you stay on these operating systems after January 14, 2020, you can continue to use Esri software, but it will not be supported. If you run into any bugs related to the operating system they will not get patched.
These changes are published in the Deprecated Features – Year-End 2018 document on the Esri Support site.