Script to Export and Import Transport Rule Collection Between Exchange Online Tenants

This script automates the process of exporting transport rules from one Exchange Online tenant and importing them into another. It connects to the source Exchange tenant, exports the transport rule collection, disconnects, and then connects to the destination Exchange tenant to import the rules. The script also handles errors and ensures proper disconnection from both tenants after the operations are complete, making it useful for migrating transport rules between Exchange environments.

Here is the script:

$SourceExchange = ""
$DestinationExchange = ""

# Install the required module if not already installed
if (-not (Get-Module -Name ExchangeOnlineManagement -ListAvailable)) {
    Write-Output "Installing ExchangeOnlineManagement module..."
    Install-Module -Name ExchangeOnlineManagement -Force -AllowClobber -Scope CurrentUser
}

# Import the module
Import-Module ExchangeOnlineManagement -Force

Write-Output "Connecting to the source Exchange: $SourceExchange"
Connect-ExchangeOnline -Organization $SourceExchange

try {
    Write-Output "Exporting transport rule collection"
    $file = Export-TransportRuleCollection

    Write-Output "Disconnecting from the source Exchange"
    Disconnect-ExchangeOnline

    Write-Output "Connecting to the destination Exchange: $DestinationExchange"
    Connect-ExchangeOnline -Organization $DestinationExchange

    try {
        Write-Output "Importing transport rule collection"
        Import-TransportRuleCollection -FileData $file.FileData
        Write-Output "Transport rule collection imported successfully"
    }
    finally {
        Write-Output "Disconnecting from the destination Exchange"
        Disconnect-ExchangeOnline
    }
}
finally {
    if ($Error) {
        Write-Output "An error occurred: $($Error[0].Exception.Message)"
    }
}