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?
carilouAsked:
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IvanSystem EngineerCommented:
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.
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carilouAuthor Commented:
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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IvanSystem EngineerCommented:
Hi,

you can quickly test this by creating autodiscover record, in internal DNS (with value autodiscover.outlook.com), and then use mobile phone or non domain joined computer. They will not pick up autodiscover SCP that is in domain, created by exchange 2007, and will be able to configure Outlook.

If that works then disable autodiscover record, created by exchange 2007, as per this article: http://www.serveroperations.net/microsoft/exchange/removing-exchange-2007-autodiscover-scp-entries-from-active-directory

Or remove entire exchange, if you don't plan on using it again. How to do that can be found in article such as: https://technet.microsoft.com/en-us/library/bb123893(v=exchg.80).aspx

I would go with above test, with mobile phone/non domain joined pc, to make sure it works, and then would remove it completely.

PS: You must have autodiscover record in public DNS, to be able to configure Outlook on mobile phones and Outlook clients connecting from outside of you network, like from home, etc. This is a must for Outlook 2016, since it uses autodiscover to configure it self.

Regards,
Ivan.
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carilouAuthor Commented:
Thank you Ivan!!
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