diff --git a/windows/security/threat-protection/intelligence/prevent-malware-infection.md b/windows/security/threat-protection/intelligence/prevent-malware-infection.md
index 3659eaeffb..884759126a 100644
--- a/windows/security/threat-protection/intelligence/prevent-malware-infection.md
+++ b/windows/security/threat-protection/intelligence/prevent-malware-infection.md
@@ -85,6 +85,8 @@ To further ensure that data is protected from malware as well as other threats:
 
 * Do not use untrusted devices to log on to email, social media, and corporate accounts.
 
+* Do not downlaod or run old Binary / Office 2003 and ealier file formats like .doc, .ppt, .xls. These file formats allow macros to be included. This can be a security risk.
+
 ## Software solutions
 
 Microsoft provides comprehensive security capabilities that help protect against threats. We recommend: