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In Microsoft Office Communicator 2007, you receive the following error message when you try to change an instant messaging (IM) conversation into a multiparty conference:
Your attempt to start a conference was unsuccessful. If you need further assistance, contact your system administrator.
This issue occurs because Communicator 2007 incorrectly creates a new conference with duration of zero minutes. The conference appears to have expired and cannot be started.
How to obtain the hotfix
This issue is fixed in the Communicator 2007 Hotfix Package that was released on November 6, 2007. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
944686 Description of the Communicator 2007 hotfix package: November 6, 2007
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.