Office 365 migration but users getting expired cert message

Hello,

   We recently converted from an in-house exchange to office 365 and now users are seeing a prompt when they open Outlook for an expired security certificate from out exchange server with GoDaddy. We have the server removed from the network and it's still prompting, Office 365 is functioning fine, but I cannot figure out how to correct the certificate prompt issue. Any help would be greatly appreciated!
JharrisonsnbsAsked:
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JharrisonsnbsConnect With a Mentor Author Commented:
Finally got a solution. CA was installed on the DC for IIS and Email, which they weren't using. revoked the certs and uninstalled the services. The prompting stopped directly after that was removed.
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woolnoirCommented:
are your outlook installations pointing at O365 CAS directly now ? check in the account prefs. DO you have any autodiscovery DNS records on your internal DNS which point at the old server ? is anything using the same IP as the old server on your network atm ?
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JharrisonsnbsAuthor Commented:
Woolnoir,

    Sorry, I'm not familiar with checking the CAS on their account prefs. Where would I go to verify that? I do see this autodiscover record in my DNS forward lookup zone. Should that CNAME record not be there now? No, nothing is using that same IP address atm.
autodiscover.PNG
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Vasil Michev (MVP)Commented:
Did you actually uninstall the Exchange server? Is the SCP object removed? SCP is the first thing Outlook clients will look for, then comes autodiscover. You can either perform a 'Test E-mail autoconfig' test from Outlook and see if any reference to the old Exchange server comes up, ro force Outlook to only look for specific location. For more info you can refer to this article:

http://support.microsoft.com/kb/2212902
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JharrisonsnbsAuthor Commented:
vasilcho,

No, exchange was never officially uninstalled, just stopped services.

I will go thru the article and see if I make any progress. Thank you!
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Adam BrownSr Solutions ArchitectCommented:
You may also want to try recreating a user's Email profile. That's usually a good idea to do when you migrate if you haven't already.
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JharrisonsnbsAuthor Commented:
I found a CA on the DC
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