If you use Zimbra, here are the setup files you need to get everything running.
Use this tool to import all of your Outlook data (Emails, Contacts, Calendars, Tasks) into your Zimbra account from your Outlook PST file.
This tool is generally used when you are first starting your Zimbra account and want to import all the data from your old system.
Zimbra Desktop looks similar to Outlook, but is free and gives you access to your Zimbra account when offline.
Install this on your Mac and it will synchronize your Mac Contacts and iCal Calendar with Zimbra.
For Email, create an IMAP account in Mac Mail.
Use this installer to setup your Zimbra account with all 32-bit versions of Outlook (Microsoft Office 2003, 2007 and 2010).
Use this installer to setup your Zimbra account with all 64-bit versions of Outlook (Microsoft Office 2003, 2007 and 2010).