We have a WIndows 2012 file server with 1.1 million files in 75,000 folders. We are about to expand dramatically. Our small staff have excellent file management skills and are very comfortable with Windows' file/folder system. Most of us have been working together for over 15 years, and we developed our folder hierarchy over that time. New staff will not have the same familiarity with our system. Although our files are well organized, we realize that this organization will not be sufficient as we grow in both our staff and our file count. File tagging is a great idea; folders don't matter as much when files are tagged. Unfortunately, we could never manually tag our existing files. Is there software that can index files and provide a search interface? We are willing to make the necessary investment. What are our options?