Old minor versions will receive bug fixes 1 year from when the next version is released.
Old major version will receive bug fixes 2 years from when the next version is released.
Example 1: EcFAT 2.1 was released 2012-04-10. Since it was a minor update from EcFAT 2.0, EcFAT 2.0 will be supported until 2013-04-10
Example 2: EcUSB 2.0 was released 2012-09-05. Since it was a major update from EcUSB 1.2, EcUSB 1.2 will be supported until 2014-09-05.
The only exception is if we know that no customers are using a particular version, then we will stop making updates for it and mark it as obsolete.