ServletExec 6.0 and 5.0 are the only supported versions.
ServletExec 5.0 will reach End-of-Life on April 30, 2013 and will then be no longer supported. Once ServletExec 5.0 reaches End-of-Life, we will still try to answer any questions you might have about that version. However, if you find a bug in ServletExec 5.0, you would be asked to upgrade to ServletExec 6.0. Patches/Updates/Hotfixes are not issued for versions of ServletExec that have reached their End-of-Life.