I was having a IM group conversation and see that after 4 hours of idle time, meaning none of the recipients were sending messages, the group conversation got timed out. The ConferenceIMIdleTimeout is not set within the client policy and as per documentation the maximum value that can be set for it is 60 minutes. Also the status within my Lync client is set to 50 minutes.
Why does the Group Conversation then expire after 4 hours? I know the same question was asked earlier too but there was no answer to it to close the thread.
Steps to replicate the scenario:
1. Select more than 1 user within the Lync client for an IM chat (Group Conversation).
2. Whether you send messages or not, does not matter, keep the conversation open for 4 hours. During this time no one should be sending any messages to this IM window
3. After 4 hours you will see the message "You have been removed from this conversation".
Waiting for an answer experts.