January 14, 2020.
Why is this date important? That is the date that Microsoft has listed as the “End of Extended Support” for both Windows 7 and Windows Server 2008R2.
This is important to note because of the the security risks that become extremely severe after support is dropped. The dropping of support from Microsoft means that no NEW security patches will be released and because of that, no open vulnerabilities in the operating systems will be patched.
What to do next
There are two approaches that can be taken to get your infrastructure to a more modern platform/operating system. Replace or upgrade. Most workstations and servers that are running either Windows 7 or Server 2008R2 are old enough that they should be outright replaced but there are exceptions.