troubleshooting Question

Migrating from Exchange 2010 to 2016 and remote Outlook clients cannot connect.

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jb1023Flag for United States of America asked on
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Moving a client from Exchange 2010 to 2016.  All clients on the LAN/VPN can connect via Outlook without issue. Clients on the WAN can connect via OWA but not Outlook.  Mobile devices cannot connect.  Email can be sent and received internally and externally.  The only issue seems to be Outlook Anywhere.  I've looked at internal and external DNS and don't see anything wrong.  I've updated the firewall polices to point to the new internal IP.  Hoping/Guessing it is a simple step I've overlooked but right now I'm at a loss, any suggestions would be greatly appreciated.
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