Exchange 2013 (co-existence 2007) - 2013 mailbox can not connect with Outlook 2010

This was working but after some problems with third party pop3 its been broken. Grrrrrrr
OWA internally works fine for my 2013 test mailboxes. It doesn't work externally yet because I have yet to cutover to co-existence. (Still pointing to the 07 CAS externally)
Internally Outlook 2010 is working for 2007 users. But for my three test 2013 mailboxes it is not. Outlook 2010 is patched to the correct level (even tried sp2)
It finds the user name - finds the server but refuses to authenticate. I have checked the outlook anywhere url on the 2013 server and I get the correct urls- internal and external set the same. I have set the service control point for autodiscover
on 2013.
Now I haven't yet cut over externally to 2013 - and my internal urls for OWA are still set to webmail. But the legacy name exists and is set internally for all others. Authentication? basic externally NTLM internally
Where do I start looking. .

Hi 
Did you try running ExRCA test ?
If you have tried whats the result for EXRCA?
Do you have a valid Certificate assigned for Exchange 2013 ?
Do you have a valid cert principal Name for Exchange 2013 ?
Do you get any errors while trying to open outlook for test migrated users ?
If so can you paste the errors
You can also use test-outlookconnectivity cmdlet to test connectivity and see the results for any errors
Note :The outlook that you are using should patched with latest patch at-least with Nov 2013 patch.
Since Exchange 2013 has minimum requirement on the outlook version. Also check the authentication for Outlook Anywhere should be NTLM in co-existence mode of Exchange 2007 and 2013.
you can verify them using ps Get-OutlookAnywhere | fl and check the Authentication method for external and internal.
Remember to mark as helpful if you find my contribution useful or as an answer if it does answer your question.That will encourage me - and others - to take time out to help you Check out my latest blog posts on www.exchangequery.com

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