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Lync 2010 client has a blank conversation window after joining an instant messaging conference

Article ID: 2736787 - View products that this article applies to.

Summary

After joining a active Lync 2010 conference the Lync 2010 conversation window does not contain any instant messages (IM)

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The design of the Lync 2010 Instant Messaging Conferencing Unit (ImMcu) limits the amount of IM information that will be submitted to the Lync 2010 conference participants. The ImMcu message history component records each IM sent by the conference participants for the first 40 seconds after the first IM is added to an IM conference. Within the beginning 40 seconds the ImMcu message history component can manage a maximum limit of 50 IM at a time in its buffer. When the limit of 50 IM is met then the first IM for the conference will be removed from the ImMcu message history component as the last IM for the conference is added to the ImMcu message history component. After the ImMcu message history component's 40 second timer expires, the ImMcu message history component will clear all IMs from its buffer. These design features of the ImMcu message history component provide conference participants with the following experiences when joining a Lync 2010 IM conference:

Participants that join the IM conference within the first 40 seconds of the IM conference will receive all of the IM that are current with the ImMcu message history component in their Lync 2010 conversation window
Participants that join the IM conference after the first 40 seconds of the IM conference will not receive any IM and their Lync 2010 conversation window

Workaround

To optimize the number of conference participants that will be able to view a Lync 2010 IM conversation window that includes the IMs that are buffered by the ImMcu message history component within its initial 40 second interval, use the following steps to sort the Lync 2010 contacts by availability:

Select the Lync 2010 Display contacts by groups (Groups) feature of the Lync 2010 contact window
From the View more layouts drop down list choose Sort by Availability
Select the available contacts that will be conference participants from the sorted contact list

These steps will help ensure that the IM conference invitations will primarily be sent to conference participants that will be available to respond to the IM conference invitations.

NoteIM conference invitations that are sent to non-responsive IM conference participants will hold for 15 seconds after receiving the toast notification for the IM conference invitation then they will join the conference by default.

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Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use

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