Outlook 2003/2007 with Windows 2000, XP, or Server 2003
C:\Documents and Settings\[User Profile]\Application Data\Microsoft\Outlook\filename.NK2
Outlook 2003/2007 with Windows Vista, 7, or Server 2008:
C:\Users\[User Profile]\AppData\Roaming\Microsoft\Outlook\filename.NK2
Outlook 2010/2013 with Windows Vista, 7, or Server 2008:
C:\Users\[User Profile]\AppData\Local\Microsoft\Outlook\RoamCache\Stream_Autocomplete_[key].dat
Outlook 2010/2013 with Windows XP:
C:\Documents and Settings\[User Profile]\Local Settings\Application Data\Microsoft\Outlook\RoamCache\Stream_Autocomplete_[key].dat
When you use the NK2Edit utility, you don't have to worry about locating the NK2 file, it automatically opens the default file for you.
