I should have checked the docs before I asked. Got the answer from 5.0
release notes:

The answer is NO. 4.5 master server will not work with 5.0 media and
clients. But 5.0 master will work with 4.5 media and clients.

Rongsheng

On Mon, Sep 13, 2004 at 11:55:25AM -0400, Rongsheng Fang wrote:
> From: Rongsheng Fang <rfang AT coke.umuc DOT edu>
> To: veritas-bu AT mailman.eng.auburn DOT edu
> Message-ID: <20040913155525.GC8250 AT coke.umuc DOT edu>
> Mail-Followup-To: Rongsheng Fang <rfang AT coke.umuc DOT edu>,
>       veritas-bu AT mailman.eng.auburn DOT edu
> User-Agent: Mutt/1.4.2.1i
> Subject: [Veritas-bu] Will NB 4.5 server with NB 5.0 clients?
> Date: Mon, 13 Sep 2004 11:55:25 -0400
> 
> Hi,
> 
> Does anybody know or can anybody confirm if NB 4.5 FP6 DataCenter Master
> server will work with NB 5.0 MP3 media server and clients? Masters and
> clients are all running Solaris 9.
> 
> Thanks,
> 
> Rongsheng Fang
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