This is a mature .Net library for working with the .Contact format introduced in Windows Vista. The features and benefits of the format itself are documented on MSDN.

Managed clients can create and manipulate contacts in the user's address book and share those changes with other applications that use the same store, such as Windows Mail and Windows Calendar. This library provides additional value beyond the COM APIs that ship as part of the Vista SDK, such as

• Allows ContactManagers to be rooted in locations other than the user's Contacts folder
• An abstraction above the file system
• Strongly typed properties for all the standard schema properties
• Group support
• vCard import/export.
• XP Support

This release is based on changeset 38707 of Contacts.Net

Changes from 1.0
Due to strong customer feedback, I've changed the .Business contact type and extension to .Organization. There are semantic differences between the two that don't globalize well, and the change is enough that I want to change it early to avoid too many people beginning to rely on it.