Provides a link to Microsoft Security Advisory: Incorrectly issued digital certificates could allow spoofing.

When in Enforcement mode, if the domain controller receives a Kerberos authentication request with an unsafe certificate, it will log legacy Event ID: 21 and deny the request.

Disabling Secure Boot significantly reduces device protection, removes safeguards against boot‑level malware, and can create new security and compliance risks. The recommended path is to ensure your device receives the updated 2023 Secure Boot certificates and any required OEM firmware updates.

Learn how to identify a phishing scam, designed to steal money via fake emails.

To prevent identity spoofing, some ISPs restrict the insertion of false information in the reply email address field. For example, if your ISP domain name ends in proseware.com, the ISP might not permit you to set your email return address as terri@contoso.com.

While we understand this 30-day period might be frustrating, this is done to protect and alert you in case the security info was removed by someone who had unauthorized access to your account.

Fixes an issue in which you receive a "There is a problem with this website's security certificate" error message when you try to visit an SSL Web site by using Internet Explorer 7.

Learn how to deal with phishing or spoofing scams or abusive messages in Outlook.com.

Resolves vulnerabilities in Windows that could allow spoofing if the attacker gains access to the certificate that is used by the end-user for authentication.

Resolves a reported vulnerability that could allow spoofing in implementations of DNS.