Outlook Security Certificate popup issue

After upgrading to Exchange 2010 from 2003, Outlook clients (2003 and 2010) are getting Security Alert pop-ups.

"Information you exchange with this site cannot be viewed or changed by others. however, there is a problem with the site's security certificate"

Red X next to: "The security certificate was issued by a company you have not chosen to trust. View the certificate to determine whether you want to trust the certifying authority"

Outcome needed:
No more Pop-ups (no client interaction, want a server resolution)
We do not have an external SSL cert and do not want to buy one.

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If you control the clients, you just need to added the root of the exchange certificate to the client root certificate store.
Jessie Gill, CISSPTechnical ArchitectCommented:
Only way to achieve what you want is to install the certificates on the machines.  Pretty much wa=hat WalterH said.  But oone thing to mention getting a Certificate for the minimal 2 names you need i.e mail.domain.com and autodiscover.domain.com is pretty cheap should only cost a few hundred bucks.  I would really consider doing that will save you lots of headache later in life.

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