Renew Self Signed Cert

http://forums.msexchange.org/m_1800490079/mpage_1/key_/tm.htm#1800490079

1. - Get-ExchangeCertificate -DomainName server.yourdomain.com
   
2. - (copy the thumbprint of the expired SSL)
   
3. - Get-ExchangeCertificate -Thumbprint <expired SSL thumbprint> | New-ExchangeCertificate
   
4. - Get-ExchangeCertificate -DomainName server.yourdomain.com
   
5. - (copy the thumbprint of the "new" SSL)
   
6. - Enable-ExchangeCertificate <New SSL thumprint> -Services:"IIS"