Robert,
The SMO 3.0 GUI has been qualified to run only on the following platforms:
Windows XP, Windows 2008, Windows Server 2003 and the same versions of UNIX listed in the SMO Support Matrix for SnapManager for Oracle 3.0.
The Java runtime environment (JRE) version 1.5 is also required.
The SMO 3.0 GUI is compatible with SMO 3.0 and not SMO 2.2.
The detailed requirements for an upgrade to SMO 3.0 can be found in the Installation and Administration Guide and Release Notes. A SMO Repository upgrade is required.
-Mark