- You deploy Microsoft Exchange Server and Lync Server 2010 Group Chat in a Lync Server 2010 environment.
- You enable user A for Exchange Server and Lync Server 2010. For example, you assign the Simple Mail Transfer Protocol (SMTP) address of "firstname.lastname@example.org" and the Session Initiation Protocol (SIP) address of “sip:email@example.com” to user A.
- You enable user B for Exchange Server. For example, you assign the SMTP address of “firstname.lastname@example.org” to user B.
- You add user A to a chat room by using the Group Chat administration tool.
- User A signs in to the Group Chat client, and then user A chats or performs some activities in the chat room.
- You disable user A for both Exchange Server and Office Communications Server 2007 R2, and then you remove the account from all chat rooms.
- You change the SMTP address of user B from "email@example.com" to "firstname.lastname@example.org." You enable user B for Lync Server 2010 by using this new SMTP address and the SIP address of "sip:email@example.com."
Note You must delete the old account in Active Directory Domain Services (AD DS) before you install the update.