Article ID: 270876 - View products that this article applies to.
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After you exit an Instant Messaging conversation with two or more Instant Messaging participants, you cannot rejoin the group or conversation. Each time that you are added back into the conversation and a message is sent to the group, the following error message is displayed in the Instant Messaging window:
Instant_Messaging_participant has left the conversation
The following message could not be delivered to all recipients:
This problem can occur because after an Instant Messaging client exits a conversation, the client rejects any messages that are sent to the client with the old conversation's session ID.
To resolve this problem, obtain the latest service pack for Microsoft Exchange 2000 Server. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/301378/EN-US/ )XGEN: How to Obtain the Latest Exchange 2000 Server Service Pack
To work around this problem, all users in the conversation must exit, and then start another conversation and invite all of the original participants back into the group.