ICloud duplicates in calendars and contacts

When I first synced iCloud with my pc and ipad2, all of my calendar entries were duplicated.  I just got an iphone4s.  I've already synced it with my outlook if I use iCloud is it going to duplicate everything again?  And if so, is there a way of preventing that from happening?

As I mentioned, nobody from Apple is here, so no matter how many times you ask, you will not get an answer from somebody at Apple.
I can answer your questions:
1) The master data is stored on the iCloud server. Each computer and iOS device subscribes to this data from the server. Each subscribed device/computer pulls the master data down from the iCloud server.
2) Changes you make on a computer or iOS device are pushed to the iCloud server over the Internet, and then the iCloud server pushes those changes to all other connected devices/computers next time they connect to the server.
3) If you make changes offline, those changes will be pushed to the iCloud server the next time you are online. The most recent changes are pushed to all subscribed devices/computers the next time they connect.
As an online service, iCloud requires an Internet connection to work at all. If you frequently make changes to your data on multiple devices whilst offline, obviously it is not going to sync back to the server and to other devices until they all connect to the Internet. The server then has to determine which data is the newest to push to all other devices.
If you are frequently offline, an Internet-based sync service possibly isn't the best choice for your needs.
You ignored my question about whether you are also attempting to sync contacts and calendars via iTunes. This will cause duplicated data. If using iCloud, you should turn off the syncing of contacts and calendars via iTunes.
Have you followed Apple's Support articles on troubleshooting contact and calendar syncing? See:
http://support.apple.com/kb/TS3998
http://support.apple.com/kb/TS3999

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