While our Mozilla Mail tutorial focuses on Windows, keep in mind that Mozilla Mail is a "cross-platform" email client: it runs and operates the same way on Windows, Apple's Mac OS X and Linux.
The Mozilla Foundation also offers the standalone Thunderbird email client: see the Mozilla Thunderbird Tutorial
Importing Address Book Contacts in Mozilla Mail or SeaMonkey Mail
If you are switching to Mozilla Mail from another email application, you will be able to import address book contacts from the following email clients: Microsoft Outlook, Outlook Express, or Qualcomm Eudora. Mozilla Mail also lets you import a list of contacts from text files.
Automatically Importing Contacts
To import contacts in Mozilla Mail, go to Tools > Import. The Import dialog will open; choose Address Books and click Next.
Choose the email client from which you will import your contacts, and click Next. (Alternatively, you can choose Text files, which supports LDIF, tab-delimited or comma-separated files - see below.)
If the operation was successful, you should receive a message like "Addresses successfully imported from [blank] - Imported address book contacts"
Click the Finish button, and open Mozilla Mail's address book (Tools > Address Book)
In our case, we chose to import contacts from Microsoft Outlook 2003. Mozilla Mail's address book now shows a Contacts address book, with all email addresses collected from Outlook's address book. The two child nodes ("Sales Staff" and "IT Dept") are two distribution lists imported from Outlook.
Importing Contacts with Text Files
Mozilla Mail also allows you to import contact lists from text file. The Import dialog will launch an Open dialog, from which you will need to navigate to the text file you want to use. In our case, we imported an LDIF address book.
After we successfully imported an LDIF address book into Mozilla Mail, the address book now shows an address book entry named after our LDIF file.
LDIF stands for LDAP Data Interchange Format, (LDAP stands for "Lightweight Directory Access Protocol").
LDIF (ASCII text file format) allows synchronization between servers using LDAP directories.


Email Clients Tutorials
Mozilla Mail Tutorial