We have Office 365 and all our autodiscover records in DNS points to Exchange Online. We have Exchange 2013 installed in internal network because we use Directory Sync (Azure AD Connect) to sync our on-premise AD users to Azure AD and we need the Exchange 2013 to manage those certain attributes in on premises. So Exchange 2013 exists only for management purposes and it doesn't host any mailboxes. Problem is that our internal Outlook clients shows a certficate error when opening because the autodiscover is redirected to this Exchange 2013 server and not in Exchange Online as it should. How we can completly disable the autodiscover that Exchange 2013 offers in internal network so that it doesn't interfere with Exchange Online autodiscover records?
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