Autodiscover service

The autodiscover work fine for computer in the domain, I change the URL of service to match the SSL installed on the Exchange 2007 Server to "mail.domain.com"
For computers not in the domain, they can open Outlook, send and receive email but they are not able to set their Out of office and access shared calendar.
I try the "Test E-mail AutoConfiguration" and the test failed because Outlook try to access "autodiscover.domain.com" and not the URL configured for the service.
I find a workaround : I add a CNAME in the internal DNS autodiscover.domain.com ->  mail.domain.com
But now I get an error when I start Outlook because the SSL doesn't match name "autodiscover.mail.com"
If I click on Yes, it's work.
How can I get rid about this warning message ?
A wildcard certificate could be the solution but it's really very expensive.

Thanks for your help
polarisitAsked:
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polarisitAuthor Commented:
Because Autodiscover in Exchange 2007 is Active Directory based, computer outside the domain could not read the server info.
Solution is to create a SRV record in the internal DNS pointing on the Exchange Server
See MS article : http://support.microsoft.com/kb/940881/en-us

Work for, just a remark, the first time you start your Outlook, you will have a message that you will be redirect on mail.domain.com, check "don't show this message again" and accept.
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sstone55423Commented:
I think you are right that either getting a new cert, or a wildcard cert may be the best answer, but I think a multiple osmain( UCC) certificate will work -- from Godaddy.com, about $89/year.
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sstone55423Commented:
Did you get everything working okay, or do you need more help?  If you got it working, please close the question.
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