Where magento store data from account info on order page

Question

Where does magento store the data which is shown in the block Account information in adminarea in order edit page?

Answer 1

in the sales_flat_order table as the rest of the order details.
A field values shows under the Account Information tab if the field name from the table starts with customer_. You can see this in Mage_Adminhtml_Block_Sales_Order_View_Info::getCustomerAccountData

Answer 2

Found..

These values are here: enterprise_customer_sales_flat_order

On order afterLoad execute following:

Enterprise_Customer_Model_Observer

/**
 * After load observer for order
 *
 * @param Varien_Event_Observer $observer
 * @return Enterprise_Customer_Model_Observer
 */
public function salesOrderAfterLoad(Varien_Event_Observer $observer)
{
    $order = $observer->getEvent()->getOrder();
    if ($order instanceof Mage_Core_Model_Abstract) {
        Mage::getModel('enterprise_customer/sales_order')
            ->load($order->getId())
            ->attachAttributeData($order);
    }

    return $this;
}