Exchange 2013 Migration Question

Hi.  
I recently moved someone to hosted exchange.  They are still getting certificate popups from the old exchange server even though they are connected to the new one that is off site.  The old exchange server is off but I'm assuming AD or DNS is still prompting for the old cert.  I will be removing exchange eventually but is there a way to suppress these cert errors in the meantime?

Thanks
hmcnastyAsked:
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Muhammad BurhanManager I.T.Commented:
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Ganesh Kumar ASr Infrastructure SpecialistCommented:
Import the certificate from the new exchange server and install it on the user pc. Also remove the old certificate of the old exchange server. You can use Start>run>mmc>Add certificate snap in for the computer and install the certificate and remove the same.
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