we want to migrate a customer that uses Outlook 2000 for long years to Zimbra Open Source Edition.
The Zimbra web-interface is great for replacing the Outlook installations on every computer, but there is one big problem: some applications need a local installed mail client that speaks MAPI!

Is there a way or a program that can send all the MAPI requests from these applications to the Zimbra web client?
We don't want to install a local mail app like Outlook or Thunderbird again that talks to Zimbra, we only want to use the web-interface of Zimbra.
A little tool that is running in the background of every Windows 7 client and redirect MAPI requests to Zimbras web-interface or something like that would be great!