Language:
OS vendors like Microsoft only offer a limited support period, after which they cease security updates on operating systems.
Without vendor support, obsolete systems are vulnerable and impossible to secure as new flaws emerge without patches to correct them. If replacement/upgrades are not possible, isolating these systems is the only way to limit exposure.
The Most Common Active Directory Security Issues and What You Can Do to Fix Them
Windows 7 support will end on January 14, 2020
End of support for Windows Server 2008 and Windows Server 2008 R2
Name: Computers Running an Obsolete OS
Codename: C-OBSOLETE-SYSTEMS
Severity: High