nxllpo:
Thanks for your work!
EDIT: Thanks VERY MUCH FOR YOUR WORK!
My system is running a recent clean install of XP Corp (not a warez copy!) fully updated. Java is installed. It is on a Workgroup, not a domain. I'm running as Administrator for test purposes.
EDIT:
I was able to make a working portable Zimbra using Thinapp per your advice.
I prescanned my system, installed Zimbra normally, postscanned the system, and built per the (easy) Thinapp wizard. Deleted the Zimbra install and all registry keys (easily found when prescanning) to return system to clean state. Load time is slow due to my slow USB key, but that's not an issue.
Now all my Windows Zimbra installs will be Thinstalls, and when inevitable Winrot sets in I can happily revert to portable backup or rescue my current Zimbra by copying it off.
Being able to download emails for offline work is nice, but being able to save the whole program make it far nicer.