My wife's absolutely favorite feature of Outlook is the fact that she can use the auto complete feature to address her emails. I will never forget when I had to setup her computer fresh and reinstall all the software. Back then I did not know about the NK2 file. All I knew is she asked where her email address shortcuts went and I of course did not have a clue. So after some research I learned about the NK2 file. By moving and backing up this file I could always give my wife her favorite feature if I ever had to reinstall Outlook or get her updated on the laptop for travel, etc. with the most recent version of her auto complete list.