SHA-1 (Secure Hash Algorithm 1) has been supported by Google, Firefox and Microsoft browsers for more than a decade. The successor, SHA-2, addresses those concerns but the industry has a long way to go to update, according to Venafi. The tech giant attempted to allay fears over the migration saying manually installed. manually installed enterprise or self-signed. certificates will not be impacted, ensuring a smooth transition for internal corporate sites mostly located behind a company s firewall.
Source: https://threatpost.com/microsoft-cutting-off-sha-1-support-in-february-for-edge-ie-11/122119/