Meeting Planning: It is now possible to invite other participants to meetings (as required or optional attendees), and assign tasks to other users. This is compatible with the iCalendar/ITip support, so it integrates with Other clients like Outlook and Lotus Notes.
Freebusy Publish & Search: Advanced Webmail now can publish freebusy information, and also query freebusy information from other people (internal or external) for meeting planning. Freebusy allows you to see available time slots on other users calendars so you can pick a meeting time that is free for all persons required
Bookable Resources: It is now possible to define company resources (meeting rooms, LCD projectors, tools, laptops, ect.) that can be booked for scheduled events.
Calendar Privacy: it is now possible to mark an event or task as private in a calendar that a user owns. When the calendar is shared, other users will not see the event details.
every user can create unlimited calendars (a company calendar and a personal calendar are provided by default)
use daily, weekly or monthly view
share calendars with other users
setup email reminders for events, even connected with popup instant messaging alerts
view all the calendars combined to get a full view at a glance and to spot overlapping events
create and edit recurring events
access and create tasks and events from PocketPC, Palm, mobile phone, either via web browser (in real time - no synchronization)