When you’ve done all that you can to diagnose a problem and you are left with the last bastian of hope that is migrating the user to a new profile (I do this by renaming the current one to something.old) along with PST’s and desktop, document and favourite folders you can also migrate Outlooks autocomplete data.
The file extention for the autocomplete data is *.NK2 which is normally located (in Outlook 2007) in %userprofile%application datamicrosoftOutlook . Copy the NK2 file into the newly created profile and ensure that the NK2 file is renamed to match whatever you have chosen to call the Outlook profile in the users new profile. Et voila, years’ worth of autocorrect data back.
