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Why do I keep getting a security alert for someone else's domain certificate in Outlook?

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Environment: Server: 2008R2 w/Exchange 2010 Client: Windows 8 Pro 64 w/ Outlook 2010
Autodiscovery/Autoconfiguration is working perfectly on my LAN and on external networks.
The Exchange Remote Connectivity Analyzer also does not report any problems with my configuration.
I have a 5-name certificate with names like these (no wildcards):
mail.mydomain.com
autodiscover.mydomain.com
mydomain.com
server01.mybusiness.local
autodiscover.mybusiness.local.

Here's the problem, intermittently, when I open Outlook, I will be prompted to accept a certificate for mail.domain.com.  Although it has words that are included in my certificate, it is not my domain, or my certificate.  Whether I accept the certificate or refuse it, Outlook works fine.  I classify this as an annoyance but it is really annoying so I would like some help getting rid of it.

Thank you in advance!


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