Both eSyndiCat and Subrion 2.x are officially deprecated and will no longer be supported starting on 1st May 2014 - neither bug fixes nor security updates. In addition, we will discontinue the services solely used for 2.x series.
You can find all the instructions how to upgrade the software in our user forums. The upgrade process might look a bit complicated, anyhow our team is here to help with the upgrades if you get stuck with anything.
You may still use an obsolete version on your website, if you don't want to upgrade. It won't stop working, as the end of life statement is only related to the support policy.
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