How to Renew or Replace Self-Signed Certificate in Exchange Server 2007

Answer Available Here

Example, how i renewed our SSL in Exchnage 2007 environment when the Certificate expired

[PS] C:\Windows\System32>New-ExchangeCertificate -domainname "scatest01.com.au", "SCATEST01" -Services "SMTP

Confirm
Overwrite existing default SMTP certificate,
'E73B30FE933569AD8411D39ED9B70C27921C5DDA' (expires 11/02/2010 2:12:25 PM),
with certificate 'C674BA0B5A3478B8055E172CD87796CBC16EF411' (expires 12/02/2011
9:27:19 AM)?
[Y] Yes [A] Yes to All [N] No [L] No to All [S] Suspend [?] Help
(default is "Y"):y

Thumbprint Services Subject
---------- -------- -------
C674BA0B5A3478B8055E172CD87796CBC16EF411 ..... CN=scatest01.com.au

[PS] C:\Windows\System32>Enable-ExchangeCertificate C674BA0B5A3478B8055E172CD877
96CBC16EF411 -services SMTP