Article ID: 937314 - View products that this article applies to.
When you try to log on to either the Microsoft Lync 2010 client or to the Microsoft Office Communicator client for the first time, you can see the presence information for all contacts. However, when an additional authentication dialog box is displayed, you cannot log on to either the Lync 2010 client or the Communicator client.
Note The additional authentication is required for Outlook integration.
This problem occurs if your mailbox has been moved from one server that is running Exchange Server to another Exchange server.
To resolve this problem in Office Communicator 2007, follow these steps:
To resolve this problem in either Lync 2010 or Office Communicator 2007 R2, follow these steps: