Documents, tools, and support information for Office Communications Server are always available at the official Microsoft Office Communications Server Web site, found at http://go.microsoft.com/fwlink/?LinkID=133631.

Office Communications Server 2007 R2 Resource Kit Tools download, found at http://go.microsoft.com/fwlink/?LinkID=133686.

Windows Server 2003 Resource Kit, found at http://go.microsoft.com/fwlink/?LinkId=134705.

Microsoft Office Communications Server Team blog, found at http://go.microsoft.com/fwlink/?LinkID=133634.

TechNet Unified Communications forums, found at http://go.microsoft.com/fwlink/?LinkID=133756.

Microsoft Office Communicator team blog, found at http://go.microsoft.com/fwlink/?LinkID=133635.

Office Communications Server 2007 VoIP Troubleshooting Guide, found at http://go.microsoft.com/fwlink/?LinkID=133758.

Microsoft Knowledge Base article 200525 provides a detailed explanation on how to use NSLookup and can be found at http://go.microsoft.com/fwlink/?LinkID=133759.

TechNet article providing information on how to create and use the host file, found at http://go.microsoft.com/fwlink/?LinkID=133760.