Need to Renew your Exchange Certificates?
Fast tutorial:
New-ExchangeCertificate -GenerateRequest:$true -Path c:\Exchange.req -DomainName sch-ca01,sch-ca02 -PrivateKeyExportable:$true -FriendlyName "Exchange Certificate" -IncludeAcceptedDomains:$false -Force:$true
Now Import it:
Import-ExchangeCertificate c:\exchange.cer
Now Enable it:
Enable-ExchangeCertificate -Thumbprint DFFA81EFC7650C536BD435D4EB406C0F8FE7B471 -Services "IMAP, POP, UM, IIS, SMTP"