Abstract: A messaging system creates a content index for messages for user selection of all of part of a message. By selecting only an indexed portion of the message, the user avoids downloading unneeded portions of the message. The content index is created according to pre-defined user criteria and semantic analysis of the contents of the message.

Abstract: A method for automatically delivering a physical mail includes receiving, by an unmanned aerial vehicle from an unmanned aerial vehicle management system, a delivery information, the delivery information includes information about a first secure mailbox and information about a second secure mailbox, the first secure mailbox being related to a first target user, delivering the physical mail to the first secure mailbox, and rerouting the unmanned aerial vehicle carrying the physical mail from the first secure mailbox to the second secure mailbox in response to the physical mail being delivered to the first secure mailbox.

Abstract: A computer-implemented method includes identifying a document accessible to a revision control system. The method identifies at least two document versions for the document. The method receives a plurality of critical artefacts. The method parses each of the at least two document versions for the plurality of critical artefacts to yield a critical artefact table for each of the at least two document versions. The method compares the critical artefact table for a first document versions with the critical artefact table for a second document versions. The method identifies one or more corresponding critical artefacts from the first version and the second version. The method compares each document version to yield a set of differences between the at least two document versions. The method organizes the set of differences between the at least two document versions based on the one or more corresponding critical artefacts.