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Follow these instructions to select a default email account.
Before you can select a default email account, you need to set up at least two email accounts.
Click here to set up your phone for POP3 email.
Click here to set up your phone for web-based email.
Click here to set up your phone for Exchange email.
Find "Default Account"
Press Mail, Contacts, Calendars.
Press Default Account.
Select default email account
Press the required email account to use it by default.
When the box next to an email account is ticked (V), the account is set as the default account.
Press the Home key to return to standby mode.