Outlook shooting out a security alert on an old SSL certificate

Hello all,
I have a SBS with Exchange 2007 on it. It used to be configured for office.olddomain.org and remote.olddomain.org. The company changed owners so we had to change it to remote.newdomain.org and office.newdomain.org. I have purchased a new SSL cert from Godaddy for the new domain SAN (remote, office, autodiscover etc). Every now and then I will have an Outlook client output a security alert on remote.olddomain.org even though I cannot find any traced of that remote.olddomain.org in the Exchange system.

I tried Get-ExchangeCertificate |FL but did not see anything there. What am I missing there? How do I find this old trace of remote.olddomain.org in the Exchange organization?

Thanks for your help.
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RantCanSr. Systems AdministratorCommented:
Outlook may have cached the old settings. Check the registry as indicated by this walkthrough.

SpiderPigAuthor Commented:
Nope didn't work, couldn't even find those regedit strings... Its office 2013 not sure if it has anything to do with it. Thanks.
I believe that remote.newdomain.org/office.newdomain.org is point to Exchange 2007 CAS server right?
Does it happen on OWA as well?
When you do test Outlook Exchange Connectivity, what the URL (e.g autodiscover, oab, ews and etc)? You can test Outlook connectivity by hold CTRL button and right clicking on Outlook icon on taskbar and test connection?
Have you try to create another outlook profile?

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