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in fact ... you have to renew the default windows certificate with export private key option enable !!!!

Get-ExchangeCertificate -Thumbprint xxxxxxxxxxxxxmywrongdefaultcertificatexxxxxxxxxxxxxxxxx | New-ExchangeCertificate -PrivateKeyExportable $true

Next come back in IIS and change certificate to the new one ... in the certificate console copy the new certificate in the trusted root folder ... then export the certificate & private key to import it in ISA if needed ^^

error message when you try to export the default new server certificate:

The private key couldn't be exported as PKCS-12. It either couldn't be accessed or isn't exportable.
+ CategoryInfo : InvalidArgument: (:) [Export-ExchangeCertificate], InvalidOperationException
+ FullyQualifiedErrorId : 77B0CDDB,Microsoft.Exchange.Management.SystemConfigurationTasks.ExportExchangeCertificate
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