Netscape Navigator or simply Navigator is DEAD.
On December 28th 2007, AOL announced that will no longer support Navigator.
You can find the original announcement here. It has already been filled with comments.
The actual story of Netscape is also fascinating (The great browser battle, Navigator vs. Explorer is now history), including stock gain records, mythical quarterly revenues, innovations, trials and many other leading to the decadence and death. You can find a very nice article here.