Page "Microsoft version numbering" Paragraph 0

Microsoft's version numbering identifies the specific release and revision of Microsoft software products.

If you are running Microsoft's Internet Explorer you can view this number by selecting " Help " and " About " from the menu.

This version number is composed of 4 parts separated by periods and may include alpha characters.

The first number is the primary version number, the second number is the secondary version number, the third number is the build number, and the fourth number is a complex number that includes the Service pack release, International Client pack, and hotfix numbers.