Due to our company changing names, we recently moved to a new domain. All users were at first getting a certificate error when opening Outlook "the name on the security certificate is invalid or does not match the name of the site." After our network admin made some changes, nobody receives this error anymore except one user. The URL at the top of the security alert is the old domain, mail.olddomain.com. I checked the users Exchange Proxy Settings in Outlook, everything is showing the URL's of the new domain so I'm not sure where this is coming from. I'm assuming it has to be something on her local machine since she is the only one who still gets the error.

Thanks in advance for any help.

Exchange server 2008

Outlook 2010

Exchange Proxy settings?

Do you mean what you see when you have Outlook open, hold down the control key, right-click on the Outlook icon in the task bar and select "Test Email Auto-Configuration"?

Usually, that would show all the URLs being used to connect to Exchange.

Hi,

Please follow all above suggestions to confirm whether the issue happens in OWA. And run Test E-mail AutoConfiguration in Outlook to check whether there is any URL settings using the old domain.

If the issue doesnt happen in OWA and your URL configurations are all same as others and set correctly, please create a new Outlook profile to have a try.

Thanks,

hold down the control key, right-click on the Outlook icon in the task bar

This should actually read "hold down the control key, right-click on the Outlook icon in the System Tray" (the area by the clock).  Right-clicking the icon in the Taskbar will not display this option.

Sadly, it took me 10 minutes and researching another website to figure this out. :-P

Thanks for the tip, nonetheless.

• Edited by thisisfutile1 16 hours 42 minutes ago Added the "control key" step for clarification