On Friday September 30th, 2011 Best Practical Solutions will cease support for the 3.6 series of Request Tracker. 3.6.0 was released on June 15th 2006 and the series has received only critical bug and security fixes since June 2008. We will continue to provide critical bug or security fixes until September 30th, 2011 if any are required.
We're currently developing a schedule for future RT series and will publish an end of life policy and schedule as soon as they are complete. The 3.8 series will continue to receive bugfixes at this time, but our development efforts will be concentrated on polishing RT 4.0 and working on the new features we have planned for 4.2.