I have a dump of contacts from a different program, it started life as an Excel (old 2003 format xls) file. I need to massage this data to work in modern mail programs, the eventual target is ...

Gmail and Google Contacts Importing contacts into Gmail automatically adds each contact record to your Google Contacts address book.

If you want to let your Google Apps users import emails and contacts into Gmail, here are the steps to follow: Sign in to the Google Apps administrator control panel.