The auto-complete list for Outlook 2007/2010 and above is stored in .NK2
Note Outlook 2007 and earlier versions store the nickname cache .nk2 file in the following folder.
- Windows XP
Drive:\Documents and Settings\Username\Application Data\Microsoft\Outlook
- Windows Vista and later versions
The auto-complete (AUTOSTREAM) list for Outlook 2010/2013 and above is stored in .dat files in the RoamCache folder under the Local AppData folders. You can access this folder by typing or pasting the following command into the address bar of Windows Explorer and pressing enter.
COPY the old autostream file to the newly created one under the new outlook profile (check by date)