Abstract: Embodiments of an event based search system utilizing an event based search index are disclosed. These events may be associated with user interaction with content such that the search index is reflective of content with which users have interacted. The event based search index can be constructed utilizing agents distributed across users' devices within an enterprise. An agent on a user's device may be configured to monitor user interactions with content across a variety of resources and generate events based on these interactions. These events are provided to the search system to create the search index. The search results returned by these search systems are based on these events and thus are also reflective of user interactions with the content. Moreover, as different events may be created for multiple users' interactions with content, the events may be reflective of the importance of content within an enterprise.