Aetna's New Jersey e-Prescribing Pilot Shows 5-7 Percent Increase in Use of Generic and Formulary Drugs.

-- By Equipping Doctors with ZixCorp's PocketScript([R]) Hand-Held Devices, Aetna Sees Adoption of e-Prescribing --

Aetna (NYSE: AET):

WHAT:  Aetna (NYSE: AET) conducted a pilot with Zix Corporation
       (Nasdaq: ZIXI) that began on July 5, 2005, providing 1,000
       handheld devices and ZixCorp.'s PocketScript service to its
       network providers in New Jersey and Eastern Pennsylvania.  The
       pilot targeted doctors who see a large percentage of patients
       with Aetna coverage.  Based on the pilot's success, the two
       companies have since expanded it to New York and Connecticut
       and have provided PocketScript to an additional 750 doctors.

       The findings:

         -- Greater ability to provide access to timely information,
            such as formulary and generic drug choices, which assists
            in lowering a member's out of pocket costs

         -- An improvement in formulary compliance of five percent and
            an improvement in generic drug prescribing of seven
            percent, which translate into cost savings for members in
            many plans

         -- Access to information to help facilitate drug safety
            checks such as drug-drug interactions at the time the new
            drug is being prescribed.

WHO:   Jeff Taylor, R.Ph.M.S., Pharmacy Director, or Ed Pezalla, M.D.,
       National Medical Director, available for interviews to discuss:

         -- More details of the pilot's findings

         -- Physicians' support and adoption of e-prescribing

         -- The ability of e-prescribing to drastically improve the
            flow of information between physicians and a patient's
            health plan and then between the physician and dispensing
            pharmacies

       Rick Spurr, CEO of ZixCorp, is also available for interviews.

       Participating doctors also available to discuss their
       e-Prescribing experience with PocketScript, an application that
       allows them to order prescriptions through a secure wireless
       mobile PDA or secure website and deliver them electronically to
       pharmacies.