New resource is available on the Microsoft TechNet. It is called Updates Resource Center for Office Communications Server 2007 R2 and Clients and it lists all Office Communications Server 2007 R2 related updates in one place.
It is available on the following address: http://technet.microsoft.com/en-us/office/ocs/ee695846.aspx.
Very useful if you have ever been in a situation where you needed to quickly determine the most recent update information for specific product.
Updates Resource Center contains all server-side updates, as well as client-side updates.