A system adapted to link email conversations is disclosed. An email client identifies email conversations from email header information and presents the conversations along with other emails in a user's inbox. The user interface receives user inputs selecting first and second email conversations and specifying that the two should be linked. The email client generates an identifier and associates the identifier with emails that are comprised in the selected first and second conversations. When a recipient receives an email that is part of a conversation that has been linked by another user, the recipient's email client notifies the user of the prior linking and provides a button with which the recipient may also implement the link. A user may select to create a new email and link the new email to an existing conversation. An identifier is generated and associated with the new email and emails in the selected conversation.