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The reason you get the error is cause your server name isn't added to the certificate that is being produced.<br />
<br />
Read steps written in the link<br />
<a href="http://support.microsoft.com/kb/940726" rel="ugc nofollow">http://support.microsoft.com/kb/940726</a><br />
<br />
You'll need to ensure that you change the following to match the FQDN on the cert.<br />
<br />
&nbsp; &nbsp; &nbsp;The Service Connection Point object for the Autodiscover service<br />
&nbsp; &nbsp; The InternalUrl attribute of Exchange 2007 Web Service (EWS)<br />
&nbsp; &nbsp; The InternalUrl attribute of the Offline Address Book Web service<br />
&nbsp; &nbsp; The InternalUrl attribute of the Exchange unified messaging (UM) Web service
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The reason you get the error is cause your server name isn't added to the certificate that is being produced.

Read steps written in the link
http://support.microsoft.com/kb/940726 [http://support.microsoft.com/kb/940726]

You'll need to ensure that you change the following to match the FQDN on the cert.

     The Service Connection Point object for the Autodiscover service
    The InternalUrl attribute of Exchange 2007 Web Service (EWS)
    The InternalUrl attribute of the Offline Address Book Web service
    The InternalUrl attribute of the Exchange unified messaging (UM) Web service

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Error Prompt when opening Outlook 2010<br />
<br />
Outlook connects after clicking the Yes option twice.<br />
<br />
Error: Information you exchange with this site cannot be viewed or changed by others. However, there is a problem with the site's security certificate exchange 2007<br />
<br />
Internal server and local domain: mail.internal.local<br />
External domain: mail.external.com<br />
<br />
Internal users receive the error.<br />
<br />
Similar article &quot;see pic for example&quot; &nbsp;(which did not work): <a href="http://www.wallaceit.co.uk/uploads/ex07sslerror.jpg" rel="ugc">http://www.wallaceit.co.uk/uploads/ex07sslerror.jpg</a><br />
<br />
I recently installed a V2 Godaddy RSA256 bit cert.<br />
<br />
Latest Exchange 2007 SP installed.
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Error Prompt when opening Outlook 2010

Outlook connects after clicking the Yes option twice.

Error: Information you exchange with this site cannot be viewed or changed by others. However, there is a problem with the site's security certificate exchange 2007

Internal server and local domain: mail.internal.local
External domain: mail.external.com

Internal users receive the error.

Similar article "see pic for example"  (which did not work): http://www.wallaceit.co.uk/uploads/ex07sslerror.jpg

I recently installed a V2 Godaddy RSA256 bit cert.

Latest Exchange 2007 SP installed.

certificate error exchange 2007 outlook 2010

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

IIS is Internet Information Services, the web server included with Windows Server operating systems. All current versions are built on a modular architecture; modules can be added or removed individually so that those required for specific functionality are installed. The full installation of IIS includes HTTP, security, content, compression, caching, logging and diagnostics.