Windows Address Book is a component of
Microsoft Windows that lets users keep a single list of contacts that can be shared by multiple programs. It is most commonly used by
Outlook Express. It was introduced with
Internet Explorer 3 in 1996 and improved in subsequent versions. The
Windows Address Book API can query
LDAP servers or read/write data to a local
.wab file. In
Windows Vista,
Windows Address Book was replaced with
Windows Contacts.