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I'm in the process of developing a plugin, and I'd like to figure out which versions of WordPress to support. But to get a good idea I'd need to know what percentages of old Wordpress versions make up the install base. Does such information exist?

Alternatively if such information doesn't exist, does anyone have a suggested version I should support my plugin back to?

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There's a page in the Codex that shows exactly that:

But really, it all depends on what features you're using. A safe bet for a new plugin would be to support WordPress 3.1.X and above (since that's the current stable release). You're setting yourself up for a lot of hurt if you try to do too much backwards compatibility work.

  • Up-voting you, because you beat me to the punch! :) – Chip Bennett Jun 9 '11 at 19:21
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WordPress.org publishes the aggregate installation stats collected by api.wordpress.org.

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