Issue with Exchange Security Certificate

Migrated to hosted exchange. Now users get a Security Alert when logging into there outlook clients.

The Security certificate is invalid but is pointing to the old certificate that had expired.
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Jordan SmithCommented:
Sounds like autodiscover is still set to the old server.  Is your Autodiscover cname set up correctly?  The certificate Outlook reports is the certificate installed on the server it is communicating with.  

Do you own the Hosted Exchange server, or are you subscriping to a third partry (O365, Godaddy, Rackspace, etc.)?
If third party, have they provided instructions on what to do with your autodiscover config for your domain?

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jyoung127Author Commented:
It was the autodiscover. I removed the 443 binding on old server and seem to have fixed issue.

Thank you for pointing me in correct direction.
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