This release of Sun Java System Instant Messaging supports the following platforms:
SolarisTM 8 (5.8) Operating System (Solaris OS) (SPARC® Platform Edition)
Solaris 9 (5.9) OS (SPARC Platform Edition, x86 Platform Edition, and Opteron Platform Edition)
Solaris 10 OS (SPARC Platform Edition, x86 Platform Edition, Opteron Platform Edition)
Red Hat Enterprise Linux AS 2.1 and AS 3.0.
A list of recommended patches for Solaris can be found at SunSolve Online.