US Patent 7818324 Searching indexed and non-indexed resources for content

Methods, systems, and apparatus, including computer program products, for searching indexed and non-indexed content. One method includes updating an index of a corpus of resources from time to time to generate an updated index for use by a search engine. Change data specifying changes made by users affecting resources are recorded. An index search result based on the most-recently updated index is received in response to a user search query. The change data is searched to identify any changes to the resources made by the user that relate to the search query and if any such changes are found, a revised search result is generated from the changes and the index search result and provided to the user as a response to the first query.