you can have v4.1, v4.2 and v5.1 clients with v4.2 server and according to
Tivoli all those are working *and* supported configurations. So you can
upgrade your server to 4.2.x.x and everything ought to be fine.
As Don said unsupported does not automatically mean broken. For old/rare
OSes many are still using old v3.1 clients (the last available for my OS/2
is v3.7.2). Just IBM/Tivoli support will recommend you to upgrade before
calling them. Be aware that v4.1 also will go out of support end of the
month. The only reason which can force you to use v4.1 clients is
client/OS incompatibility. The latter is real, i.e. v4.2 client would not
work with Win95 and v5.1 would not with 95&98. But you cannot sign a
support contract with a maillist :-)

Zlatko Krastev
IT Consultant




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Subject:        TSM v4.1 clients NOT compatible with V5.1 server?

Hello all,
         If I am reading things correctly, all my v4.1 clients are NOT
compatible with V5.1 server.  Nor is a V5.1 client (where supported)
compatible with a V4.1.5 server.   Is this supposed to be a multi-step
upgrade?   Am I therefore supposed to tell management that the presence of
WIN95 laptops will stop our ability to upgrade to V5.1, (because they do
not
have a v4.2 client)  ?
http://www.tivoli.com/support/storage_mgr/compatibility.html

I am running v4.1.5 server on z/OS 1.1.   I have WINxx (all of them )
clients, AIX, SUN, Novell, and MAC clients mostly v4.1.  Has anyone gone
this route already or can tell me what migration path I can take?
Matt