NOW, you can completely replace outlook with Google's services. Calendar makes the toolset complete for me.
Add this to your must have toolchest.
Welcome to Google Calendar: "Wouldn't it be great to be able to keep track of all the events in your life, coordinate schedules with friends and family, and find new things to do -- all with one online calendar? We thought so, too. Learn More
Seeing the big picture
With Google Calendar, you can see your friends' and family's schedules right next to your own; quickly add events mentioned in Gmail conversations or saved in other calendar applications; and add other interesting events that you find online.
Sharing events and calendars
You decide who can see your calendar and which details they can view. Planning an event? You can create invitations, send reminders and keep track of RSVPs right inside Google Calendar. Organizations can promote events, too.
Staying on schedule
You can set up automatic event reminders, including SMS notifications, and instantly bring up anything on your calendar with the built-in search tool."