Caro Eduardo,
1. Gere um novo certificado baseado no antigo
Get-ExchangeCertificate -thumbprint “70E9E6927749A35EEF09C5A131F5D4E089C42CAB” | New-ExchangeCertificate
2. Depois pegue o Thumbprint do novo certificado
Get-ExchangeCertificate | fl thumbprint
3. Copie o novo thumbprint (vai ser diferente do thumbprint antigo).
4. Ative o novo certificado:
Enable-ExchangeCertificate -Thumbprint "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX" -Service IMAP
Enable-ExchangeCertificate -Thumbprint "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX" -Service POP
Enable-ExchangeCertificate -Thumbprint "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX" -Service IIS
Enable-ExchangeCertificate -Thumbprint "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX" -Service SMTP
5. Remova o antigo
Remove-ExchangeCertificate -thumbprint “70E9E6927749A35EEF09C5A131F5D4E089C42CAB”
Lúcio Veloso Guimarães MCTS Microsoft Exchange Server 2010, Configuration MCITP Enterprise Messaging Administrator 2010