[stuaxo]

Lots of open source takes 10 years to hit 1.0.

Though 1.0 usually has a different meaning in both world's.

1.0 usually includes a set of features the project had in mind at the beginning in open source. Whereas in closed source it usually means the first version that works to a minimal extent.

Closed source 1.0 equals open source 0 point something.

[spacemanmatt]

I generally take version numbers near 1 to be market communication about stability/fitness. Above that, I take version numbers as a loose grouping of significant change sets.