UPDATED 16:22 PM EST, February 19, 2013
Virtually the same for 20 years, the U.S. Postal Service has changed the barcodes it uses to help deliver mail.
The POSTNet, used for the last 20 years, was replaced Jan. 28 by the Basic-Service Intelligent Mail, or IMb, barcodes. The postal service hopes that businesses who use the basic service will eventually switch to full-service IMb's.
