If you worked with NFuse prior to version 1.7, you're probably familiar with Citrix's Project Columbia. Project Columbia was a set of web pages that replaced the default NFuse web pages. Columbia supported many advanced features, such as Citrix XML service load balancing and connecting NFuse web servers to multiple server farms.
Most of the core functionality of Project Columbia has been incorporated into NFuse Classic 1.7 or Enterprise Services for NFuse. Therefore, no versions of Project Columbia are compatible with NFuse 1.7, and no new versions are being developed.