AIX TSM server upgrade questions

[Dale Gieseke]

Will be upgrading TSM server from V4.2.1.15 to V5.1.7.2 in about two weeks. The server 
is on AIX 5.1 ML3.
Two Questions:
 
1.) Is TSM server level 5.1.7.2 reliable?
 
2.) I have two old NetWare clients at the V3.1.0.5 level and two AIX clients at the 
V3.1.0.6 level.  These clients can't be upgraded because of OS levels. Will these old 
clients continue to work after the server upgrade?
 
Thanks in advance for any comments or advice.
 
Dale Gieseke
TSM administrator