Getting certificate popup in outlook after exchange 2007 install

I have two servers m201 and m202 that are both hub and cas servers. I built two new servers, m203 and m204, and will install exchange with only the cas role. I am then going to remove the cas role from m201 and m202.

Well, I installed exchange 2007 on m203 with cas and mailbox role (I plan to use m203 for public folders as well) and now my outlook clients are getting a certificate popup. It looks like I missed a step or two when confguring exchange 2007 on server m203.

what's causing the popup?

I am running exchange 2007 sp3 ru4
My new server m203 is a windows 2008 ru2 server
My old servers m201 and m202 are windows 2003 server

thank you
cert-from-m203.jpg
cyberleo2000Asked:
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Rajkumar-MCITPCommented:
who all are getting an error message? is those users who are having mailbox in m203?

Your issue and the resolution is explained here. kindly have a look and inform if any issue

http://support.microsoft.com/kb/2006728
cyberleo2000Author Commented:
m203 does not have any mailboxes, it is only a cas server. can I export the cert from my other server m201 or m202 and import it into m203?
Rajkumar-MCITPCommented:
Exchange Certificates on assigned based on service and not at computer\server level. You can check the details by

Get-ExchangeCertificate | fl

See how many certificates are there and is that valid etc.

For the error message your are getting, you have to install the certificate in trusted root container..

Inform if any issue

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cyberleo2000Author Commented:
m201 and m202 each have two certificates, but m203 does not have any certificates installed, so I guess I have to install it?
cyberleo2000Author Commented:
project cancelled and servers turned off. I guess that solves the problem :)

thank for your help.
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