Latest version of NetScreen Security Manager

I've been asked to investigate how much work would in involved in upgrading our current version of NSM to the latest version. I've looked all over the Juniper website, but they don't seem to want to tell anybody what the latest version is !! They'll tell me on their fact sheet what it supports, what it does etc ... but what the actual version is seems to be the best kep secret in the world !! Either that or I'm going blind. Does anybody know what the latest version is? We're currently running version 2004 FPBr1 Build LGB3z1r1