Fix redirect

Author: Maddy-Cloudflare

public/__redirects

@@ -496,6 +496,7 @@
 /cloudflare-one/email-security/directories/manage-ms-directories/manage-groups-directory/ /cloudflare-one/email-security/directories/manage-integrated-directories/manage-groups-directory/ 301
 /cloudflare-one/email-security/directories/manage-ms-directories/manage-users-directory/ /cloudflare-one/email-security/directories/manage-integrated-directories/manage-users-directory/ 301
 /cloudflare-one/email-security/setup/partner-domain-tls/ /cloudflare-one/email-security/setup/pre-delivery-deployment/partner-domain-tls/ 301
+/cloudflare-one/email-security/setup/pre-delivery-deployment/prerequisites/office365-email-security-mx/ /cloudflare-one/email-security/setup/pre-delivery-deployment/prerequisites/microsoft365-email-security-mx/ 301
 
 # firewall
 /firewall/api/cf-lists/ /waf/tools/lists/lists-api/ 301