Outlook 2016 / Exchange 2010 automatic configuration

Exchange 2010, autodiscover records are correct and have no issues.  Autodiscover DNS records are correct and ping the correct public IP.  The SSL certificate includes the autodiscover host names.  There has never been an issue connecting from Outlook, phone, tablet, etc. through manual configuration.  But now, with Outlook 2016, automatic configuration is required and it is failing.  I'm trying it right now from Outlook 2013 because it gives me more information.   It establishes the network connection, it finds the email settings, pops up the login box.  I enter domain\username, and the password, and then get the error "Outlook cannot log on.  Verify that you are connected to the network and are using the proper server and mailbox name... "  If I click OK it brings up the correct local host name of the server and mailbox "=SMTP:{email address}.  I can't figure out what is wrong.  Should it be bringing up the public host name rather than the local one?  If so, where is it entered wrong?  I'm tearing my hair out trying to figure this out!  Help!
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Muhammad BurhanManager I.T.Commented:
You should have to configure autodiscovery for outlook2016.
you should do the second choice (if currently you only have office 2016 installed): uninstall 2016 --> install 2013 --> Set up exchange account --> upgrade 2016

Setup autodiscovery:
landiiiks2Author Commented:
Thanks.   As I said,  autodiscover is set up and working correctly.  It passes all tests.   Plus I would get an error on stage two if it wasn't working,  not stage 3.  It is finding the correct server,  it just isn't logging in.
Muhammad BurhanManager I.T.Commented:
Actually outlook2016 uses Mapi/http to use autodiscovery instead of RPC over http,
Please ensure that exchange firewall allow MAPI over HTTP.
To disable MAPI/HTTP and force RPC/HTTP, set this key on the client computer.
DWORD = MapiHttpDisabled
Value = 1
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landiiiks2Author Commented:
Exchange 2010 does not use MAPI over HTTP.  Although Outlook 2016 uses MAPI over HTTP, it also uses Outlook Anywhere (RPC over HTTP).  Otherwise no Exchange 2010 or earlier servers could ever connect via Outlook 2016.  And I know that isn't the case - I've successfully connected Outlook 2016 to both Exchange 2007 and 2010 (without any registry hacks or other changes).  Also, in this particular case, the automatic connection is not working from Outlook 2013 either.  Yet the manual connection works perfectly.  And again, Outlook is making the connection to the server.  It just won't take the last step of logging in.
Amit KumarCommented:
Did you check it only for one user or for e-mail address it is happening, it is possible for which e-mail address you are trying it is hidden in GAL. Please give a try to another e-mail and which is already working in Outlook 2010/2013.
landiiiks2Author Commented:
I wish it had been that easy!   But no, the addresses I am trying are not hidden.  For what it's worth, I have tested with a VPN open to the network and it works.  So that would suggest something with the firewall, but 443 is open (and if it weren't it also wouldn't work with manual configuration or OWA).  Everything from inside is allowed out.  I don't know of any other port that is necessary for this to work...
Amit KumarCommented:
can you perform test connectivity ExRCA from this site using ActiveSync, Outlook Anywhere..


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landiiiks2Author Commented:
Thank you!  I feel stupid now - it had passed all the tests I had tried before but for some reason I skipped one...  It turns out Outlook Anywhere was not enabled - I have no idea why.  But it is now, and is working fine!  Thanks!
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