At least on Linux this won't work. When I tried upgraded a client from
5.5 to 6.1, backups worked fine. I then ran into a bug that affected 6.1
but not 5.5, but when I downgraded none of the backups were visible.
After I upgraded the backups were visible again, so I just waited for
the bug to be fixed in 6.1.

On 09/02/10 01:24, Stefan Folkerts wrote:

What are the consequences of downgrading a TSM client from 6.1/6.2 to 5.5 on 
Windows?
I expect the systemstate as it was backed-up using the 6.x clients won't 
restore but will file/archive restores work?

Regards,
   Stefan

--
-- Skylar Thompson (skylar2 AT u.washington DOT edu)
-- Genome Sciences Department, System Administrator
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-- University of Washington School of Medicine