- Advanced VoIP calling features are unavailable in Office Communicator 2005
- Internet Explorer unexpectedly closes when you refresh a Web page
- A telephone number may contain a clock icon instead of the number zero in Communicator 2005
- Error message when you try to shut down Windows: "End Program-WMS Idle"
- You experience poor video quality in Communicator 2005 running through a multipoint control unit
- Communicator 2005 responds to invitations to conversations with a "Busy" reply
- Communicator 2005 stops responding during a video conversation with Communicator 2007
I guess it must be cumulative and include the updates from the February 10th hotfix(KB903928) as it also updates Communicator.exe, now updated to build 183 (From 121).