Fixing Internal SSL Certficate Warnings in Outlook 2010

Installed 2013 SP1.
We have a Split Domain Foobar.local and Foobar.com
We got a Certficate for Foobar.com
All is good on the public side.
All is good on the internal side except for Certificate Warning User has to keep saying yes to.
We understand the problem but none of our fixes work.
1) We know if inhouse domain was foobar.com it would work. We prefer not do that. We know it could be renamed as well.
2) We could live with installing certificate on each client (only 20 or so). But it does not work. Prefer not have to do anything special on each client.
3) We changed virtual Directories in ECP to use http on Internal instead of https (basically how old server was). No go.
4) We unchecked requires SSL in IIS on OWA, Autodiscover, EWS. No go.
5) We could get an internal Certificate but that won't be allowed in Nov 2015 and cost extra money.
6) Outlook 2013 works. Outlook 2010 and 2007 pop warnings. Somehow Outlook 2013 knows !!
7) We could run our own CA but that seems really overkill.
I get a little worried disabling SSL stuff as it might allow something external to not use SSL.
How do admins typically deal with this?
Even with SSL not required and set to http on virtual directories you can see clients are still connecting with SSL.

Thanks Martina It Worked !!
What threw us off is in ECP (easier) you could not set the Internal URI on Autodiscover.
You have to do AutoDiscover in powershell.
Also some virtual directories have been renamed or replaced.
So we did what made sense (owa, ews, etc.) [I forget which, need to recheck things]
I think the real culprit was AutoDiscover, the only one we missed because ECP has no access.
So in total:
You must do the DNS thing (forward zone mail.contoso.com -> NETBIOSNAME IP Addr)
In ECP Virtual Directories Set most Internal URL's
from netbiosname.mydomain.local to mail.contoso.com (leave it https).
You must do the same to AutoDiscovery using Exchange PowerShell (not accessible in ECP)
Set-ClientAccessServer -Identity <NETBIOSNAME> -AutodiscoverServiceInternalUri
https://mail.contoso.com/autodiscover/autodiscover.xml
Change Internal URL on Outlook Anywhere in ECP -> Servers -> YourServer -> Outlook Anywhere from netbiosname.mydomain.local to mail.contoso.com

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I am Chetan Savade from Symantec Technical Support Team.
Are you using SEP 12.1 RU3 (12.1.3001.165) Prior version? If yes, it's a known issue please upgrade to the latest version of SEP. SEP release details are available here:
http://bit.ly/m0vOJp
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Thank you for answer - no luck
>NExt og to Connection tab - Exchange Proxy settings - Proxy authentication settings - is it set
>to NTLM or Basic?Give it a try on one of them.(if set to NTLM change to basic and vise versa).
On both settings the same results - Outlook is prompting for password.
>Another thing you could try is og to Internet Explorer - tool -internet options- Security - click local
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>Do this on Trusted sites as well,if Your domain is listed under trusted sites
The same results - Outlook isprompting for password.
Should not be some kind of mapping set somehow in AD between user.name(at)contoso.com and user.name(at)contoso.local?
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Fixing Internal SSL Certficate Warnings in Outlook 2010

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