Microsoft has begun pushing out its May 2019 Windows 10 update, which will flag Wi-Fi networks that are using the outdated and insecure WPA and TKIP authentication mechanisms. The older protocols have known flaws that allow easy decryption by eavesdropping. That makes man-in-the-middle (MiTM) and malware-injection attacks that much more effective. Devices that are compromised at a public hotspot (in an airport, say, or a coffee shop) can then carry an infection back to a corporate network, when they attach to corporate cloud apps.
Source: https://threatpost.com/microsoft-wi-fi-protection/145053/