Business Manager is in last name order, but turns to first name or

I recently imported my business manager contact list into a new computer
using the same Office 2007 version of Outlook. In my former computer, my
business contact order was by last name and when I wanted to send an email to
a client and clicked on "TO", the names were in last name order. Now, my
business contact list displays in first name order when I select "TO", even
though it displays in last name order under business contacts. I have been
unable to locate a solution to this problem so far. All suggestions are
greatfully received.

Chuck Carr in cold, windy Toronto, Canada