As previously announced, with the release of RT 4.2, Best Practical will shortly cease support for the 3.8 series of Request Tracker -- specifically, on March 31st, 2014. The RT 3.8 series was first released in July 2008 and has received only critical bug and security fixes since 2011. We will continue to provide critical bug or security fixes until March 31st, 2014 if any are required.
Please see our release policy for our general policy on the lifespan of RT's releases.