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Enable additional services on an existing UCC

Use the commands from below:

Exchange 2007:
Enable-ExchangeCertificate -Thumbprint $THUMBPRINT -Services "POP, IMAP, IIS, SMTP"
Exchange 2010:
(Note: do not use quotation marks)
Enable-ExchangeCertificate -Thumbprint $THUMBPRINT -Services POP, IMAP, IIS, SMTP
Replace $THUMBPRINT with the certificate thumbprint this can be found by viewing the certificate under the certificate details inside the Microsoft Management Console's Certificate Snap-in for the Local Computer account.

Note: Also, if you have existing services, you will need to re-list them upon entering the command.