Clearing the Outlook To Line Cache
Author: jason
Date: 2009-09-11 15:57:26
Category: Technical

Sometimes when an email address changes Outlook doesn't want to forget the old one. There is a way to clear the list of addresses that pop up as you begin typing in an address in the To or CC line of a new message.

One step would be to disable to Auto-Suggest feature
1) Go into Tools - Options.
2) Then Preferences - Email Options
3) Then Advanced E-mail Options
4) At the bottom, uncheck "Suggest names while completing To, CC, and Bcc fields"
5) Click OK until you are back to Outlook

Or, if you just wanted to start fresh, you could delete the NK2 file in Outlook 2007 and earlier. Outlook 2010 does not use the NK2 file, but puts the cache in a hidden mail message.

1) Close Outlook
2) Find the .NK2 file
3) Delete the NK2 file
4) Open Outlook, enjoy life

You may need to uncheck "Hide file extensions for known file types" into Windows Explorer, Tools, Folder Options, View

You can find the NK2 file in your profile in C:\Documents and Settings, at this folder: Application Data\Microsoft\Outlook

This is all or nothing, you can't just remove one address. Deleting the NK2 file removes all the pop-up cached addresses. This does not remove the Contact list, or Personal Address Book, or the Global Address List. This simply clears the cache of pop-up names that appear after you start typing an address in the To/CC/BCC/From lines.

Your NK2 file will be named whatever your Outlook profile is called. The default is Outlook. If you have multiple profiles there will be multiple NK2 files, one for each profile.

jason @ - - copyright 2009