# Import the Active Directory module
Import-Module ActiveDirectory

# Define source and destination attribute names as variables
$sourceAttribute = "personalTitle"
$destinationAttribute = "extensionAttribute1"

# Retrieve all users where the source attribute is not empty
$usersWithSourceAttribute = Get-ADUser -Filter "$sourceAttribute -like '*'" -Properties $sourceAttribute, $destinationAttribute

# Loop through each user and update the destination attribute with the source attribute's value
foreach ($user in $usersWithSourceAttribute) {
    # Extract the value of the source attribute for readability
    $sourceValue = $user.$sourceAttribute

    try {
        # Copy value from source attribute to destination attribute
        Set-ADUser -Identity $user.DistinguishedName -Replace @{$destinationAttribute = $sourceValue}
        Write-Host "Successfully updated user: $($user.SamAccountName)"
    } catch {
        Write-Host "Failed to update user: $($user.SamAccountName). Error: $_"
    }
}