As announced a year ago, and again last month, we will stop actively supporting MODX Revolution 2.2.x starting today, July 16th, 2015. This is exactly a year after MODX Revolution 2.3 was released, which has hopefully given you enough time to upgrade.
By upgrading our minimum requirements regularly, we can take advantage of new features and core improvements more easily, allowing us to spend more time on cool features rather than implement backwards support.
Please note that we will not be actively breaking our extras in 2.2. We'll leave in existing version specific code for now, but new features will only be tested in and optimised for 2.3 and up.