Messaging Server OS Support
From MsgServerDocWiki
What Operating Systems does Messaging Server support?
Messaging Server 6.3 (Communications Suite 5) supports the following Operating System Platforms:
Solaris OS 9,10 on SPARC/x86 Redhat AS/ES 3.0/4.0 on x86
Support for Windows NT/2000 and HP/UX has been dropped for this release.
For further details please refer to the release notes:
http://docs.sun.com/app/docs/doc/819-4432/6n6j7s81m?a=view
NB: Although CentOS/Fedora may be a derivative of Redhat, they are not-supported and are not-tested in any way. Customers have reported that attempts to install Communication Suite 5 on these derivatives has failed.

