You cannot receive a chat room invitation in the Microsoft Office Communications Server 2007 R2 Group Chat client.
This issue occurs because the lastInviteID value that is located in your local preferences is larger than the value of the lastInviteID that is located in the Group Chat server database. Therefore, the Group Chat server assumes the client received the latest invitation, and does not send a new invitation.
To fix this issue, install the following cumulative update:
2549044 Update package for the Office Communications Server 2007 R2 Group Chat server: June, 2011
The lastInviteID valueon the Group Chat client is located in the following file: %appdata%\Microsoft\Group Chat\Group Chat Console\Preferences\username\Invitations
To verify the lastInviteID value that is located on the Group Chat server database, follow these steps:
Open SQL Server Management Studio.
Select the database for group chat.
In the dbo.tblPrincipal table , select the record of the user who cannot receive invitations and note the prinID.
In the dbo.tblLastInviteId table , select the record with that prinID from the previous step.
The lastInviteID value that is related to the prinID is the value for lastInviteID.