Get-Mailbox -ResultSize Unlimited | Where-Object {$_.PrimarySmtpAddress -like ‘@old-domain.com’} | ForEach-Object { $newPrimaryAddress = $_.PrimarySmtpAddress -replace ‘@old-domain.com’, ‘@example.com’ Set-Mailbox $_.Identity -PrimarySmtpAddress $newPrimaryAddress # Optionally update aliases $_.EmailAddresses | ForEach-Object { if ($_ -like ‘@old-domain.com’) {
$newAlias = $_ -replace ‘@old-domain.com’, ‘@example.com’
Set-Mailbox $_.Identity -EmailAddresses @{Add=$newAlias}
}
}
}
Get-Mailbox -ResultSize Unlimited | Select DisplayName, PrimarySmtpAddress
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