I've install Office 2010 Plus 64bit on Windows 7 Pro. When I launch my outlook my email autocomplete doesn't work. I know that 2010 doesn't use the NK2 file anymore but can still import it. I rename my .NK2 file to take out the .old ending and then use the run command " outlook /importnk2" . This imports the NK2 and the autofill does work. But next time I launch outlook the autofill is gone again. I have to keep renaming the file and using the run command each time I open outlook to have the autofill function. Does anyone have a solution to this problem.