Manual:Extension support/Versions/2011-09-23

Run on 2011-09-23, sample size of 433 public, patrolled, active wikis. Please note that this does not take into account any intranet wikis (of which there are many and are often out of date), public wikis we've missed or login-only public wikis. It does not include large wiki farms (like wikia) as they tend to upgrade all their wikis at once and run the same software behind the scenes. Their number of wikis may be staggering, but they tend to only run one codebase each and don't often install new 3rd party extensions. It should only be used to give you a rough idea of installations out there.

Looking at the table data, we can see that supporting anything before 1.15 is not that important, the people on 1.4.x will likely never upgrade, but the rest of the world has. But we can see that any extension author really should be seriously considering supporting 1.16.x, it's what the majority of the people are running. 1.19 and 1.18 not being prevalent is not a surprise, they don't have releases yet (but some people can't wait!). Supporting 1.15.x seems like a decent idea looking at numbers alone, but with a release around the corner you can expect a lot of people to "move up one".

It's important to note that the dates used here to give you an idea of "how long ago" was when developers first started preparing the code for that release, not when it was actually released.