Microsoft Office Delve accomplishes this by making it easy to identify files that you need to work, even when you can’t locate or describe them.

Microsoft Office Delve, a new information discovery and content management application, monitors content and tailors information discovery to each person’s content and work habits. Delve is based on Office Graph technology. This technology uses machine learning to track the links between people, content, and activities across Office 365 applications. The relationship maps that Graph creates pushes use patterns to news feeds personalized for each user.

Delve measures the relevance of each file that workgroup members create, change, and share. The more relevant a content is to your work—and the more closely you work with others to create and share it—the more relevant the file is to you. When you look for files, the most relevant ones appear on the search list.