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carilou
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Migrating Mail from Exchange 2007 to Office 365 Enterprise E3

Yesterday we migrated our mail from our Exchange 2007 server to Office 365 Enterprise E3.  When we try to set up mailboxes with the new Outlook 2016, we never get the opportunity to enter the new Office 365 login, we immediately get the attached errors. It also gives a certificate error that references our old server (which I did not manage to get a picture of) .   Somehow it is trying to access the old mail server and we can't get any further.  We flushed dns and that didn't work either.  It seems somehow our internal dns is pointing to the old server.  How do we get rid of it?
Microsoft OfficeExchangeMicrosoft 365DNS

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carilou

8/22/2022 - Mon
Ivan

Hi,

you forgot to attach an error :)

btw, did you remove exchange 2007 from your organization? If he is still there, or you have just turned it off, then autodiscover would point to your mail server, and not office 365, and that is a problem.

PS: Autodiscover for you domain should point to autodiscover.outlook.com

Regards,
Ivan.
carilou

ASKER
Thank you Ivan! We have not removed the old exchange server, we just stopped all the exchange services on it.  I'm not sure exactly how to remove it from the domain.  Can you point me to a process that will remove it correctly?
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Ivan

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carilou

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Thank you Ivan!!
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