If you have a "my msn" account, you can download "intellisync" for free.
Let's say you are at home and have put in a calendar entry in your home
Outlook. You start intellisync and it updates your MSN calendar online. When
you are then in your office you use Intellisync to sync your MSN calendar to
your Office Outlook. It also updtes your contacts and adresses. Intellisync
for MSN if free.