Hello All, I m new to this grp, and Novice to work on Exchange Server. I wud like to know: 1. What is the difference between Microsoft Exchange Server 5.5 and 2000?? 2. Which one I shd use?? 3. Any links or study material from where I can study, how to add/delete/modify contacts/task/calendar using any own application(Not legacy)?? 4. From where I can get the APIs to do all above things?? Looking forward for help from all xperienced people of this list. Thx in advance. Rgds, Jenny __________________________________________________ Do you Yahoo!? Yahoo! News - Today's headlines http://news.yahoo.com