Replace existing Exchange certificate

I need to replace an existing SSL certifiacte to resolve certificate errors. It has the same name as the existing enabled certificate. When I run the Import-ExchangeCertificate cmd, I get an error Cannot import as there already is a certificate wi
th a thumbprint of 1CCD77D28F9664E6AC6A0E72B866C064D8D774D
When I try to remove the existing certificate, get this error
Remove-ExchangeCertificate : The internal transport certificate cannot be remov
ed because that would cause the Microsoft Exchange Transport service to stop

What would be the proper cmd sequence to complete this task?
cookd47Asked:
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cookd47Connect With a Mentor Author Commented:
Dell Support worked with me to remove and setup the SSL certificate.
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Glen KnightCommented:
I would recommend a handy free 3rd party utility I found that will manage SL certificates for you.

Check out my blog post here: http://demazter.wordpress.com/2010/06/15/exchange-2007-ssl-certificates/
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smartsidCommented:
The certificate you are trying to remove is internal self-signed certificate which is required for transport service to run.

You can run new-exchangecertificate cmdlet to get a new self-signed certificate.

Moreover, what are the error messages related to certificate and is it impacting mail flow ?
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Mkris9Commented:
cos having 2 certificates with with same name is fine. but with same thumbprint ? are you trying to import the same certificate again ?
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