Microsoft ended extended support for Windows Server 2003 on July 14, 2015 . This means no new security patches, including those for critical vulnerabilities exploited by modern malware. Running this OS today is highly discouraged for any internet-facing or business-critical system. This report is intended for legacy/air-gapped environments or historical reference. Report: Antivirus for Windows Server 2003 (Legacy Systems) 1. Executive Summary Windows Server 2003 (WS2003) is an end-of-life (EOL) operating system. While modern antivirus (AV) vendors no longer support this platform, several solutions were historically compatible. Today, protecting WS2003 requires a "defense-in-depth" strategy, including legacy AV signatures, application whitelisting, and strict network isolation. 2. Historical Antivirus Solutions (2003–2015 Era) During its supported lifecycle, the following enterprise-grade AVs were standard:
