Tested the words 'attach', 'attachment', and 'attached' in an email to myself. Didnt work
"Deployed" the zip file in Zimbra Admin, didnt select "flush zimlets" and enabled it on my account. Also cleared all my cache, restarted firefox, and logged back in.
What test conditions should this trigger on? On Release 6.0.4_GA_2038.RHEL5_64_20091214174341 RHEL5_64 NETWORK edition. If you can get it to work, I'm sure it would be useful to all Zimbra users! You'll be a hero to many!