After you migrate users from Microsoft Live Communications Server 2005 to Microsoft Office Communications Server, users cannot log on to the Office Communications Server by using a Microsoft Office Communicator 2007 client or a Microsoft Office Communicator 2007 R2 client. When this happens, users receive the following error message:
Your account is not configured to use the Communications Service. Contact your system administrator.
Additionally, the Communicator client tracing logs may log the following error code that is returned by the server:
421 Extension required
This issue occurs if the Enable enhanced presence option for individual users is not enabled in the Active Directory Users and Computers snap-in for Office Communications Server.
To resolve this issue, follow these steps:
In the Active Directory Users and Computers snap-in for Office Communications Server, right-click the user account, and then click Properties.
On the Communications tab, click Configure.
In the User Options dialog box, click to select the Enable enhanced presence check box, and then click OK.
Click OK to close the user Properties dialog box.
ImportantAfter you enable the enhanced presence feature for a user, the user account is converted to use enhanced presence feature when the user logs on to Office Communications Server by using the Communicator 2007 client or Communicator 2007 R2 client. The user will not be able to sign in to Live Communications Server 2005 Service Pack 1 again. Also, the user cannot use any earlier versions of Office Communicator, of Microsoft Office Communicator Web Access, or of Microsoft Office Communicator Mobile to log on to Office Communications Server.
For more information about Office Communications Server, visit the following Microsoft Web site:
Microsoft Office Communications Server 2007 Enterprise Edition, Microsoft Office Communications Server 2007 Standard Edition, Microsoft Office Live Communications Server 2005 Enterprise Edition, Microsoft Office Live Communications Server 2005 Standard Edition, Microsoft Office Communications Server 2007 R2 Standard Edition, Microsoft Office Communications Server 2007 R2 Enterprise Edition, Microsoft Office Communicator 2007, Microsoft Office Communicator 2007 R2