The Walkthrough topics in this section demonstrate the following Microsoft Lync 2010 SDK contact and group programming tasks:

• Search a global address book for a contact.

• Request and display current contact presence information.

• Change the privacy relationship between a contact and the local user.

• Build a collection of contacts as a component of a user interface.

• Create custom contact groups and manage group membership.

A local user's contact store resides on Microsoft Lync Server 2010 and is provisioned on a client using an asynchronous pattern where a client submits contact information requests to a server and the server responds with specific information. As shown in the following illustration, Microsoft Lync 2010 API exposes a set of events that you must handle to obtain the contact information sent by Lync Server 2010.

Important
Lync Server 2010 can accept a request from a client for a subscriptionto contact presence. After a successful subscription, Lync Server 2010 sends presence information to local clients after a user republishes his or her presence. The local client should expect to handle contact presence-related events without taking any action beyond the initial subscription.