Updating Exchange certificates
Federation makes free/busy times and on-prem calendar/contact sharing available through Exchange Online. Process to renew is different if the cert has already expired.
TlsCertificateName must be formatted like
<I>issuer DN<S>subject name, e.g.:
$cert = Get-ExchangeCertificate -Thumbprint ABC123 $cert = "<I>$($cert.Issuer)<S>$($cert.Subject)" Set-SendConnector "Outbound to Contoso" -TlsCertificateName $cert Set-ReceiveConnector "Default Frontend Exchange" -TlsCertificateName $cert