NK2 file in Win 7

The Outlook 2003/2007 default NK2 file location is the same in Windows 7 x64 and x86 -- C:\Users\{username}\AppData\Roaming\Microsoft\Outlook\zzzzzzz.NK2 (z = Outlook profile name). This also applies to Vista and Server 2008.

The Outlook 2010 NK2 file is actually a DAT file and is located, on the above operating systems, at C:\Users\{username}\AppData\Local\Microsoft\Outlook\RoamCache\Stream_Autocomplete_y_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.dat (y = file index, x = random 16-byte key in hex form).

 

If you haven't unchecked 'Hide extensions for known file types' under Tools > Folder Options > View, then the file will just be called "Outlook" or "Default" (whatever your Outlook profile is named), instead of Outlook.NK2 or Default.NK2. Also, Windows 7 classifies it as an "Office Data File" in the 'Type' column.

If this file is not present, Outlook will create a new one when you open the program. Hope this helps!

Follow these instructions to import your NK2 into Outlok 2010: http://support.microsoft.com/kb/980542

若要将 .nk2 文件导入 Outlook 2010,请按照下列步骤操作:

  1. 确认 .nk2 文件位于下列文件夹中:
    %appdata%\Microsoft\Outlook
    注意.nk2 文件必须拥有与当前 Outlook 2010 配置文件相同的文件名。默认情况下,配置文件名称为“Outlook.”要检查配置文件名称,请按照下列步骤操作:
    1. 单击「开始」,然后单击“控制面板”。
    2. 双击邮件
    3. 邮件设置对话框中,单击显示配置文件
  2. 单击开始,然后单击运行
  3. 打开框中,键入outlook.exe /importnk2,然后单击确定。此操作应当将 .nk2 文件导入至 Outlook 2010 配置文件。

    注意导入 .nk2 文件之后,文件的内容将合并到当前存储在邮件箱中的现有昵称缓存中。

注意:首次启动 Outlook 2010 时,.nk2 文件将会重命名为 .old 文件扩展名,因此,如果您试图重新导入 .nk2 文件,请删除 .old 文件后缀名。


Reference:

http://answers.microsoft.com/en-us/windows/forum/windows_7-files/nk2-file-in-windows-7/cc808260-e3d9-4219-a981-da1b5a97c017

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