Abstract: Systems and techniques for transmitting electronic data by receiving, at a communications system host, electronic data transmitted from a sender and addressed to an intended recipient; authenticating the electronic data based on attributes of the electronic data and appending information to the electronic data indicating that the electronic data has been authenticated.

Abstract: Some implementations may enable instant messages to be automatically forwarded. For example, a computing device may receive an electronic message and an indication of a sender-specified destination for the electronic message. The computing device may determine whether the destination is available to receive an electronic message using a first mode of communication. The computing device may determine whether a mobile telephone number is associated with the destination. The computing device may transmit a communication to the mobile telephone number based on the electronic message in response to determining that the destination is unavailable and that the mobile telephone number is associated with the destination.

Abstract: A method is described for call treatment based on user association with one or more user groups. The method includes receiving a phone call from a call source that is directed to a call recipient, identifying a user group associated with the call recipient, and determining a number of received indications assigned to the user group. The received indications are assigned to the user group by users associated with the user group, and the received indications reflect a desire by the users for a special treatment of future calls from the call source. The method also includes distinguishing treatment of the phone call from the call source based on the number of received indications.

Abstract: Transferring instant messaging sessions includes receiving a selection, from a user within a user interface, of at least one instant messaging session from among multiple instant messaging sessions to transfer from a first instant messaging controller on a first device to at 5 least a second instant messaging controller on a second device, where the user is signed on concurrently to the first instant messaging controller on the first device and the second instant messaging controller on the second device. At least a portion of the selected instant messaging session is transferred from the first instant messaging controller on the first device to the second instant messaging controller on the second device and the transferred portion of 10 the instant messaging session is made perceivable on the second instant messaging controller on the second device.

Abstract: A secure instant messaging (IM) system integrates secure instant messaging into existing instant messaging systems. A certificate authority (CA) issues security certificates to users binding the user's IM screen name to a public key, used by sending users to encrypt messages and files for the user. The CA uses a subscriber database to keep track of valid users and associated information, e.g. user screen names, user subscription expiration dates, and enrollment agent information. A user sends his certificate to an instant messaging server which publishes the user's certificate to other users. Users encrypt instant messages and files using an encryption algorithm and the recipient's certificate. A sending user can sign instant messages using his private signing key. The security status of received messages is displayed to recipients.