If your users are familiar with outlook 2000, then all you have to teach them is how to login. After that, it's pretty much all Outlook. There are some patches that you might want to put on for OWA. These patches includes fixes on how things are done in OWA, such as contacts, tasks, and calendars. Not ALL fucnctions operate on OWA than they do in just outlook. These patches are designed to fix those.