A system is provided which utilizes a threading service to offer enhanced features for a document management system including an email system. Various enhanced email features may be provided through one or more of the following components: a delete module, a reply module, a profile module, and a search module. The delete module enables a user to delete a selected message, a set of related messages, or the whole set except for the selected message. The reply module enables a user to send a reply message to all addresses associated and involved with an entire set of related messages. The profile module enables a dynamic interest profile to contain all relevant information from an outgoing message and a set of messages related to the outgoing message. The search module enables search results to include documents which match the user's query as well as documents related to the documents which match the user's query.