In addition, it's suppose to make the handset just run a tad bit smoother to make the overall experience just easier to swallow for owners. As with any software update, it's recommended to backup your data via BlackBerry Desktop Manager before proceeding with installation. Once you've got that all taken care of, you'll be able to take joy knowing that your handset is up-to-date with everything.
RIM BlackBerry Curve 8530 Specifications | Review
source: Verizon & CrackBerry