I have the nk2 file stored in the correct folder. The problem is that when I enter the command "outlook.exe /importnk2" I get an error displayed "Cannot Start Microsoft Office Outlook. The command line argument is not valid. Verify the switch you are using". Has anyone got a solution to this error ?

Please make sure that the .nk2 file is in the following folder:

%appdata%\Microsoft\Outlook

 

Note The .nk2 file must have the same name as your current Outlook 2010 profile. By default, the profile name is "Outlook." To check the profile name, follow these steps:

1. Click Start, and then click Control Panel.
2. Double-click Mail.
3. In the Mail Setup dialog box, click Show Profiles.

this solved it for me. I was working in d:\users\username\appdata\roaming\microsoft\outlook which wasn't the same as %appdata\Microsoft\outlook

thanks