- User A and user B joins an Instant Message (IM) conference by using Microsoft Lync 2010.
- An SQL Back-end failover occurs.
- During and after the failover, the conference roster is changed because of an action. For example, a user joins or leaves the conference.
Note after the update is applied, Lync 2010 rejoins the focus conferencing component when the client receives the 488 not acceptable here response.