Version numbers are not a concrete specification in software development.
In other words, one team may use 1.0.0.0, others may use 1.0.0 and so on. It matters not.
Just choose something that works for you.
Typically major.minor.revision is the most simple and straight forward method to use. Visual Studio for example can assign version numbers automatically for you, as can other tools. So all you are required to update is the major/minor values. The build/revision numbers are updated automatically.
