We have got alert from USPS which is about upcoming updates:
January 26 USPS Web Tools Update: USPS Web Tools will be implementing changes and additional features to the U.S. Postal Service APIs listed below effective January 26, 2014 with testing available January 13th.
But I can't find official patch for Magento CE 1.7. Will new updates affect to our store, we only use Priority Mail and stamps.com integration. Thanks for helps.