What are major, minor and build version numbers?
Product versions are typically displayed as four numbers separated by periods, such as 6.0.6000.0. The first number is the major version number, the second is the minor version number, the third is the build number and the fourth is a revision (hotfix) number. A change in the major or minor version number indicates a completely new release of the product and is typically a chargeable upgrade from a previous version. If the major and minor version numbers are unchanged, but the build or revision number changes, this indicates a service pack or hotfix update for the current version and these are made available at no charge.
