I've been trying to install Zimbra desktop on my ibook since yesterday. Each time I download the program and install it, I get an error stating 'zimlets couldn't be installed. some components may be missing' but the icon is on the desktop. When I click on the desktop icon, nothing happens.

I've installed, uninstalled and reinstalled several times. What am I missing?

I'd appreciate any help at all.

Running an iBook G4, v 10.4.11, 1.42 GHz, with 21GB of available memory.