When a Microsoft Office Live Meeting organizer removes meeting attendees from a meeting, the meeting is removed from the Live Meeting service. This problem occurs if the organizer sends the meeting update by selecting the "Send updates only to added or deleted attendees" option in Microsoft Office Outlook.
To resolve this problem, install the following update rollup:
980924 Description of the update for the Live Meeting Conferencing Add-in for Outlook: April 2010
To work around this problem, select the "Send updates to all attendees" option in Outlook when the organizer sends the meeting update.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.