I am running Exchange 2007 on a domain, all of the clients have Win XP Pro and Outlook 2003. I have been behind on some updates with the workstations. I recently went through and ran updates and something changed that I hope can be changed back. We use contact list in Public Folders, one of the contact list are about 11,000 contacts and we add it as an address book in outlook. Be for the updates in a new message I could click "To:" and select the address book, and then search by last name. After the updates when I select To: and the address book they are listed by first name. There are about 30 users that have been searching these contacts by their last name for over 5 years, They are not used to searching by first name and want it changed back. Any suggestions?