In a Microsoft Office Communications Server 2007 R2 environment that has instant messaging (IM) integrated with Outlook Web Access (OWA), the OWA functionality does not work periodically. For example, a user encounters the following issues:
Slow response or no response from the OWA server for certain user actions
Unavailable IM and presence functionality
This issue occurs because the Unified Communications Managed API 2.0 cannot handle the errors that occur while parsing the container membership data from the server. Therefore, the OWA process restarts periodically.
To resolve this issue, install the following update:
2686823 Description of the update for Office Communications Server 2007 R2, Unified Communications Managed API 2.0 Core Redist 64-bit: April 2012
For more information about the ContainerMembership class, visit the following Microsoft website: