Autodiscover service not working for Outlook with Exchange 2013 in .local internal .org external domain for laptops not joined to domain.

We have upgrade from SBS2003 to Windows 2012 and a separate Exchange 2013 server. We now have a .local internal domain and .org external domain.

Outlook 2010 will not connect to Exchange on the laptops which are not domain members . Only the domain member PCs can connect Outlook 2010 to Exchange.

I've used the https://testconnectivity.microsoft.com  tool and if fails each Autodiscover test.

How should I be configuring Autodiscover (i.e. via URL, DNS SRV record etc)  some forums suggest that I should not use DNS - Not sure why.  Should I be able to find and read the content on the Autodiscover.xml on the exchange server because I can't.   Can anyone  help please?  Thanks.
EICTAsked:
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David Johnson, CD, MVPOwnerCommented:
you have to use dns but your internal dns may not be sufficient.. so use an external dns for your name server records and anything accessible from outside your network

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EICTAuthor Commented:
Hi,
Thanks for the links.  Since Autodiscover gets its details from IIS Autodiscover.xml I though I'd look here as Exchange seems to be configured correctly.

In IIS I can browse to view the content of the xml but interesting I notice.
1. It wants me to use port 81 and 444 (not 80 and 443) not sure why the install configured these ports and
2. When I do open the xml in my web browser I get the following invalid request. I expected to see server configuration information which is used to configure outlook.

<?xml version="1.0" encoding="UTF-8"?>
-<Autodiscover xmlns="http://schemas.microsoft.com/exchange/autodiscover/responseschema/2006">
-<Response>
-<Error Id="4235073522" Time="09:28:10.6023866">
<ErrorCode>600</ErrorCode>
<Message>Invalid Request</Message>
<DebugData/>
</Error>
</Response>
</Autodiscover>

Does this indicate a problem with IIS settings?
EICTAuthor Commented:
Looking at this further it appears that port 80 & 443 are for the front end (default website) and ports 81 and 444 are for the back end website.  

I still get the same Invalid Request though.
EICTAuthor Commented:
Thanks. I shall try this. Sorry I've been working on other things so I may need to start the resolution process again!
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