Installing your Certificate on Exchange 2007 goes through the Exchange Management Shell. You copy the received SSL Certificate into your Exchange 2007 server (this must be the same one as where you created the CSR). Then use the Import-ExchangeCertificate cmdlet to install the SSL Certificate.

NOTE: Do not use the IIS console or the MMC snap-in because these will not work with Exchange 2007!
 

Step 1: Start the Exchange Management Shell

Start as an administrator the Exchange Management Shell on the server where you want to install the actual SSL Certificate.
 

• Start
• All Programs
• Microsoft Exchange Server 2007
• Exchange Management Shell

Step 2: Installing/Importing the SSL Certificate
 

In this step we have unpacked the SSL Certificate and stored it in the file c:webmail-hereyourname-com.cer. You can now import the SSL Certificate with the following command.

Import-ExchangeCertificate -Path c:webmail-hereyourname-com.cer 

Step 3: Activate the SSL Certificate

To activate the SSL Certificate, you should specify which services must use the SSL Certificate in Exchange.

Enable-ExchangeCertificate -Services SMTP

If you want to use the SSL Certificate for multiple services, you can use the following command. 

Enable-ExchangeCertificate -Services "IMAP, POP, UM, IIS, SMTP" -Thumbprint "[thumbprint from step 2]" 

If you have forgotten the thumbprint you can retrieve it with the Get-ExchangeCertificate cmdlet.

Get-ExchangeCertificate -DomainName webmail.hereyourname.com