[2] The Windows Address Book API can query LDAP servers or read/write data to a local .wab file.

The Windows Address Book is an application that has a local database and user interface for finding and editing information about people, making it possible to query network directory servers using Lightweight Directory Access Protocol.

Microsoft Exchange / Windows Messaging uses.PAB file for Personal Address Book.

In May 2000 the ILOVEYOU virus showed how the Windows Address Book could be part of an exploit to spread malicious software by accessing and sending email to a user's contacts.

One of the undocumented features of the Windows Address Book is integration with Microsoft Office Outlook.