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.nk2 file extension

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.nk2

Microsoft Outlook NicKname data file. Also known as an autocomplete name list. A binary file used by Microsoft Outlook that contains auto-complete information, this is the information used by Outlook that lets it suggest the full email address when only part of the email address has been entered.

The .nk2 file is a hidden file. Its location varies according to the version of Windows:

Windows Version	Location
Windows NT	`C:\WinNT\Profiles\<username>\`
Windows 2000	`C:\Documents and Settings\<Username>\Application Data\Microsoft\Outlook`
XP
Vista	`C\Users\<username>\AppData\Roaming\Microsoft\Outlook`

Relevant links:

www.nk2.info - NK2.info project site, providing a free (donation-based) utility to view and export the contents of a .nk2 file.
www.timeatlas.com/mos/Email/Outlook/Advantages_of_Outlook_AutoResolve_and_AutoComplete/ - Notes on Outlook Auto-Complete covering the .nk2 file.
http://office.microsoft.com/en-gb/outlook/HA011394511033.aspx - Microsoft article on moving the auto-complete name list to another computer.

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