We just recently upgraded to 4.2 from 3.1 - and while we did upgrade some
clients - the ones we didn't worked just fine.. (Solaris, NT, Netware,
Linux, AIX)

Hope that helps. It was a fairly smooth upgrade on an AIX server. We did run
into some quirky settings on our Retain deleted files that caused expiration
to never finish. When we changed the settings from keeping a copy forever to
a set period of time like 90 days, and we had deleted 19,000,000 files off
our mail server - everything was perfect.

Jane
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Jane Bamberger
IS Department
Bassett Healthcare
607-547-4750