Suspicious mail gets flagged before anyone opens it, with a plain-English warning banner sitting right there in Outlook.
Phishing remains the single most common way attackers get in. A convincing fake invoice or a spoofed request from “the boss” is designed to catch someone off guard on a busy day. A visible warning banner is often the thing that makes someone pause for that extra second.
Any business that runs on email, which is to say, all of them.
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