What do the numbers in a version typically represent (i.e. v1.9.0.1)?

In version 1.9.0.1:

  • 1: Major revision (new UI, lots of new features, conceptual change, etc.)

  • 9: Minor revision (maybe a change to a search box, 1 feature added, collection of bug fixes)

  • 0: Bug fix release

  • 1: Build number (if used)—that’s why you see the .NET framework using something like 2.0.4.2709

You won’t find a lot of apps going down to four levels, 3 is usually sufficient.

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