Попробуйте так
Код:
Get-Mailbox -ResultSize Unlimited |
Select-Object DisplayName,ServerName,PrimarySmtpAddress, @{Name="EmailAddresses";Expression={$_.EmailAddresses|
Where-Object {$_.PrefixString -ceq "smtp"} | ForEach-Object {$_.SmtpAddress}}} |
EXPORT-CSV C:\SMTP.CSV -NOTYPEINFORMATION -Encoding UTF8