iPhone Contacts not sync-ed back to Exchange/Outlook Contacts

Any contacts I created in my Outlook via Exchange are sync-ed to iPhone without any problem. But not vice versa. I notice it may be because I have multiple email accounts, such as gmail, yahoo, icloud, etc besides Exchange, set up in iPhone. As such iPhone doesn't know which email account the newly-created Contact in iPhone will be synce-ed to.
But I really want the Contacts created in iPhone be able to get sync-ed to Exchange/Outlook. How to do that? Please help.
CastlewoodAsked:
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Michael-BestCommented:
Turn on contact sync for your gmail, yahoo, icloud, etc, on your iPhone to sync all your contacts to gmail, yahoo, icloud, etc.
Open the Settings application on your iPhones's home screen.
Follow the instructions in the link below.

stackexchange.com
http://apple.stackexchange.com/questions/31656/how-do-i-move-my-iphone-contacts-to-gmail

Google Instructions:
https://support.google.com/a/users/answer/138740?hl=en&rd=1
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