Exchange2007憑證更新或延長

一年期的憑證要到期了.. 憑證是自建的,
兩個問題請教

1. 如何更新或延長 ?
2. 若沒有使用到 pop3s smtps 等服務可否忽略 ?

get-exchnage-certificate log:

AccessRules        : {System.Security.AccessControl.CryptoKeyAccessRule, System.Security.AccessControl
CryptoKeyAccessRule, System.Security.AccessControl.CryptoKeyAccessRule, System.S
}
CertificateDomains : XXXXXXXXXXXXXXXXX
HasPrivateKey      : True
IsSelfSigned       : True
Issuer             : CN=XXXXXXXXXXX
NotAfter           : 2010/12/29 上午 11:49:09
NotBefore          : 2009/12/29 上午 11:49:09
PublicKeySize      : 2048
RootCAType         : None
SerialNumber       : D5CC3FD5881245B34C1259012D8E3196
Services           : IMAP, POP, SMTP
Status             : Valid
Subject            : CN=XXXXXXXXXXX
Thumbprint         : 1FA1973957034ADD3806444229420871BD1A1D171233434

AccessRules        : 
{, System.Security.AccessControl
                     .CryptoKeyAccessRule, System.Security.AccessControl.CryptoKeyAccessRule}
CertificateDomains : XXXXXXXXXXXXXXXXXXXXXXXXXXXXX
HasPrivateKey      : True
IsSelfSigned       : False
Issuer             : XXXXXXXXXXXXXXXXXXXXXXXXXXXXX
NotAfter           : 2010/12/23 下午 12:10:24
NotBefore          : 2008/12/23 下午 12:00:24
PublicKeySize      : 2048
RootCAType         : Enterprise
SerialNumber       : 1D486218000000000003
Services           : IMAP, POP, IIS
Status             : Valid
Subject            : XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Thumbprint         : 6B84EF0D49E72FC2EF27BE9718B5701449215B6855445445

感謝~~~