Address books and contacts
From Just Solve the File Format Problem
Data interchange formats
- adr (Microformats)
- hCard (Microformats)
- LDAP (Lightweight Directory Access Protocol)
- LDIF (LDAP Data Interchange Format)
- vCard (.vcf)
Program-specific formats
- Cardfile (.crd)
- Microsoft Outlook contacts
- Mozilla Thunderbird contacts
- Notes Storage Facility (Lotus Notes; holds calendars, contacts, e-mail, and other things)