Linked content is identified in a first electronic message, the linked content corresponding to a portion of a source document. A second electronic message that is associated with the first electronic message is received and includes a version of the linked content. A user interface is generated that represents the second electronic message and includes a version selection user input mechanism that is actuatable to select the version of the linked content in the second electronic message. Based on user actuation of the version selection user input mechanism, the version of the linked content in the second electronic message is selected and automatically incorporated into the source document.