What you've identified is definitely an issue with BCM imports. We used the concatenation feature in Excel to combine address lines for the import, as you did. It does the import just fine, but like you discovered, when you need to export them, you find the fields have shifted on those contacts and the result isn't good. If you can make use of the PO Box field during the import, that may give you a better result. You can also experiment with using the Business Address field and the Business Street field to see if that will give you a result you can live with. If you find this is a show-stopper for you with BCM, please take a look at our website - Microsoft Dynamics CRM might be a better answer for you. Please let us know if we can help.