OL2002: How to Reset the Nickname and Automatic Completion
Use the steps in the following section to reset the Outlook 2002 nickname cache for both Microsoft Windows 2000 and Microsoft Windows Millennium Edition (Me).
-Quit Outlook.
-Start Windows Explorer.
-On the Tools menu, click Folder Options , and then click the View tab.
-Under Advanced Settings , click to select the Show hidden files and folders check box.
-Click OK .
-Click Start , point to Search , and then click For Files or Folders .
-In the Search for Files or Folders box, type *.NK2 in the File Name box.
-In the Look In box, click to select your local hard disk.
-Click Search Now .
-Right-click the .NK2 file with the name of the profile that you want to reset, and then click Rename .
-Rename the file to profilename .bak, and then press ENTER.
-Quit Windows Explorer.
-Restart Outlook.
Outlook will generate a new nickname cache.