Outlook The Security Certificate Was Issued By A Company You Have Not Chosen To Trust

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Outlook The Security Certificate Was Issued By A Company You Have Not Chosen To Trust

If you are using a self-signed certificate (common in private or corporate environments), you must manually tell Windows to trust it. Experts Exchange OUTLOOK - Security Certificate Issue - Experts Exchange

In this article, we will dissect the technical meaning of this certificate error, explore the 5 most common causes, and provide step-by-step solutions for Windows, Mac, and mobile versions of Outlook.

This error is more than just a nuisance; it is a roadblock that prevents you from accessing your emails, calendars, and contacts. While the wording sounds ominous, suggesting a breach or a malicious actor, the reality is often much more mundane. In most cases, this is a configuration issue, not a cyberattack. If you are using a self-signed certificate (common

Hackers can set up fake Wi-Fi hotspots (e.g., "Starbucks Free WiFi") and intercept Outlook traffic. If you see this error in a public place, never click "Yes" .

If you are an individual user seeing this pop-up, try these methods in order: 1. Manually Trust the Certificate While the wording sounds ominous, suggesting a breach

Warning: This reduces security. Only use in controlled, internal networks.

If you manage an Exchange Server or Office 365 hybrid environment, you can stop these errors for all users: If you see this error in a public place, never click "Yes"

Never click "Yes" to this error on a public network. Always verify the "Issued by" field. When in doubt, call your IT helpdesk and ask, "Did you guys recently roll out a new internal root CA?"

Sometimes the Mac version caches old certificate data. Remove and re-add the Exchange account in Outlook for Mac.

: The certificate was issued by a legitimate but obscure provider that is not in your computer's built-in list of trusted companies. Step-by-Step Fixes for Users

To prove it is legitimate, the server presents a . Think of this certificate like a digital passport. It tells Outlook, "I am who I say I am."