XP Outlook 2007 clients cannot connect to Exchange 2013. Windows 7 machines are ok.

I have a new install of Exchange 2013, with the DC on a separate machine with Server 2012. I'm trying to setup users on it. Machines that have Windows 7 connect completely fine. No interaction is needed to get Outlook up and running. 

Machines with Windows XP SP3 cannot connect at all. Using Internet Explorer and going to https://mail.domain.com/owa shows a "Internet Explorer cannot display this webpage". Trying to connect with Outlook 2007 shows a "Connection to Microsoft Exchange is unavailable. Outlook must be online or connected to complete this action." error box. 

Both the DC and Exchange machines are using Centralized Certificates. I have SSL certs for both the mail.domain.com and autodiscover.domain.com installed. 

I can connect to https://mail.domain.com/owa from Firefox and Chrome on the XP machines and all shows OK. Just not IE. 

This is the log from Outlook when trying to connect:

Autodiscover to https://autodiscover.domain.com/autodiscover/autodiscover.xml starting
GetLastError=12030; httpStatus=0.
Autodiscover to https://autodiscover.domain.com/autodiscover/autodiscover.xml FAILED (0x800C8203)

All tests from TestEchangeConnectivity pass.