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It was an interesting experience browsing through Zimbra mail. I was wondering , if there is a plan to add "Task" functionality in Zimbra.
Also, I would like to know how I can contribute to Zimbra effort, being an content management consultant with multiple years of user interaction experience.
Yes Task/Todo support is on the roadmap. As for helping you can report bugs or issues you find after installing our software. Soon we'll have a public bug database so this will be easier. Also take look at our Top Projects page. This has some ideas about things we'd like help on.
Bugzilla
Wiki
Source
Task Functionality 
Linear Mode
