After creating a new Outlook profile in 2007 or 2010 you will notice your autocomplete file will be missing. If you are like me, that autocomplete file is so handy for those email addresses you forgot to save in your address book. Here are the steps to recover your autocomplete file (.NK2 file) !
Step One: Make sure Outlook is closed. Find what the name of the new profile is. Go to Control Panel > User Accounts > Mail > Show Profiles. You will see a list of the Outlook profiles. Make note of the profile you are using.
Step Two: Outlook stores your autocomplete email address in a cache called a .NK2 file. Locations different slightly on where the .NK2 file is stored but you will find the file under one of these paths. Go to Drive C: on your computer and browse to C:\Users\ <username>\appdata\Roaming\Microsoft\Outlook or C:\Users\ <username>\appdata\Local\Microsoft\Outlook.
Step Three: You should see two .NK2 files. One for your old Outlook profile and one for your new Outlook 2007 or 2010 profile.
Step Four: Cut your new Outlook profile’s autocomplete file and paste it on your desktop. Make note of the name of the autocomplete file.
Step Five: Go back to your old Outlook profile’s autocomplete file and right-click on it. Select rename and rename the old autocomplete file to the name of the new autocomplete file.
Step Six: Open Outlook and create a new email. You should see all your autocomplete addresses populating!
This was posted by techspeeder.