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It appears that what you are looking to do is from another product at Nokia called Nokia Messaging. Go to mail.nokia.com and setup a messaging account and add the gmail and yahoo accounts there. Then SMS send the configuration program to your device. Install it. it will add all the accounts to your device on install and will send messages to your device. So at this point you will have Mail for Exchange for you corporate mail and Nokia Messaging for you personal mail ( gmail and yahoo).