On my 7250, when in the messages view, you can go to options and chose what data field you want your address book sorted by (first name, last name, company).
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Now you can call me STORMin' Norman, except my name isn't Norman.
i have my 7100R set to FIRSTNAME LASTNAME but it always displays in outlook to LASTNAME, FIRSTNAME. In Outlook, my default setting are set to FIRST NAME LAST NAME but it ALWAYS saves the contacts as LASTNAME, FIRSTNAME...so annoying!!