We are actually looking to do the same thing within the next few months.
I think you are able to move over your lists to a new server with the
list files. We contacted LSoft and supposedly you are able to move over
your users as well without them having to re-register. We tried testing
the upgrade on another server but couldn't seem to get it to work which
is what made us think to start from scratch. 
 
Caitlin Franco

-----Original Message-----
From: LISTSERV site administrators' forum
[mailto:[log in to unmask]] On Behalf Of Demeny, Dave
Sent: Tuesday, December 16, 2008 4:36 PM
To: [log in to unmask]
Subject: Upgrading from Listserv 1.8d to 15.6 and a new server

We are about to upgrade our Listserv server from Windows 2000 to 2003
and the version of Listserv from 1.8d to 15.6 and we would like to get
some details on how best to go about this upgrade.  Would it be best to
first build a new server with Windows 2003 and then install the version
15.6 of Listserv on that server?  When we do this will we be able to
import the list from our current Listserv to the new server or do we
need to build our new server with the Listserv software version 1.8d and
then upgrade the Listserv software as a second phase?

 

Thanks,

Dave