Bottom line, I'm getting different answers from IBM support, from our IBM
reseller, from the newsgroups, etc.  I am desperate for some feedback from
someone who has actually made it to the other side.  I'm going to have to
give this another go very soon and I'm not at all looking forward to it.

ANY experiences or suggestions you can share are GREATLY appreciated!!

As I mentioned, we made it just last week from 4.1.3 to 5.1.1.6
(direct). It only took us 18 hours, of which 13-14 hours was doing
the deletion of SYSTEM OBJECTS, per this list.

When we finally did CLEANUP BACKUPGROUPS on the new 5.1.1.6 system,
it only took 30 seconds. We have about 100 Windows servers (though
less than half are Win2K) and a 16 GB TSM database.

It's possible that if we didn't do the SYSTEM OBJECT deletions, it
may have taken the same time, or even less for all we know. But I'm
just happy it was under a day, and we are fine on the new server
(other than Informix db-level backup :(.

johnn