Office 365 Outlook 2016 - Security Certificate has expired

Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g., so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.

My domain is:

I ran this command:

It produced this output:

My web server is (include version):

The operating system my web server runs on is (include version):

My hosting provider, if applicable, is: GoDaddy

I can login to a root shell on my machine (yes or no, or I don’t know): I don’t know

I’m using a control panel to manage my site (no, or provide the name and version of the control panel): I don’t know

When I open Outlook 2016, I get a popup that the certificate has expired or is not yet valid for my domain. I am the only employee who receive this alert out of many employees for this company. I have tried creating a new Outlook profile and even setting up my email on a different computer and the same error pops up no matter what. Not sure why my email is the only one receiving this error but I have reached out to all companies that are involved in my domain (GoDaddy, Microsoft, AppRiver) and they all tell me to come here. I reached out to and they explained that they don’t offer support so now I am reaching out to the community hoping someone knows why my email in particular is experiencing this issue.

Thank you all in advance

Hi @ct-pgh,

From what you said, you’re just a user of this service, not the system administrator, right? But you’re the only user who encounters this error message?

It looks to me like the certificates that might be relevant are all expired, but maybe there’s some other explanation.

What mail server are you trying to access with Outlook? Is it or some other server name?

Not the admin and only user who encounters this, yes.

I see what you are saying… that link you sent shows the same certificate that I have been having pop up on my screen. How do I go about renewing that?

It is Microsoft’s hosted Exchange that I am accessing.

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