We want to import a significant number of contacts into our Exchange database.We have these headings so far :givenNamesndisplayNamemailHow would we add custom attributes?Simply add:CustomAttribute1if the user should have that attribute and so forth? i.e. put CustomAttribute2, 3, 4 as needed.

You will need to populate the header line with all the possible custom attributes. The contact entries that don't have a value for a particular attribute will simply show nothing, e.g.: givenName,sn,displayName,mail,customAttribute1,customAttribute2,customAttribute3 Bob,Smith,"Bob Smith",bob.smith@mail.com,blah,,blah Sue,Jones,"Sue Jones",sue.jones@mail.com,,,, Are you planning to use csvde or the import-csv Powershell cmdlet? Tony

The import-csv Powershell cmdletEDIT - I assume that's OK then?

Yes, absolutely. Here's an example I put together which you should be able to modify to suit your needs. http://www.open-a-socket.com/index.php/2009/12/13/bulk-create-active-directory-contact-objects/ Tony