What is the latest release of osCommerce?

A lot of people wonder what is the latest osCommerce version. It is still osCommerce Online Merchant v2.2 Release Candidate 2a or what we call RC2a for short. If you have osCommerce MS2.2 then as long as you have applied the security patches issued over time, you should be fine.
However there was one serious MS2.2 defect fixed in RC2a. It relates to searching for a Category in Admin to then delete it.  If you delete a Category listed in a search results listing, you will find your your entire catalog is deleted. It is a little known bug because it is a very rare action to take.  However it is a serious defect as to recover from it is not simple.  You would need to get your last backup, extract the “catalog” data and restore it.   Take the risk or get it patched.