I created a template to alter the mail message header and I added it to my manifest.xml
I did this 6 month ago with dwt Widgets and this template is still working but the new one does not work.
We updated Zimbra since but as the old one is still working I don't see any reason why this would break.
I also know that the template should work, because when I create a symlink in the root zimbra template folder to my skin folder it loads perfectly.
Any ideas why this doesn't work? Did I missed something?