How to Clear the Auto-Complete Email Cache in Outlook

When migrating over to the Hosted Exchange platform, some of you may have experienced the following message when trying to send to recipients

This could be due to cached Automatic name fill-in (AutoComplete) Entries. As you begin to type in an email address or name, suggestions from a list of names and e-mail addresses that you have typed before are shown in the To, Cc and/or Bcc fields, this is known as the AutoComplete name list. In order to resolve this issue, you should delete the unwanted name by using the UPor DOWN arrow keys, when the cached name or address is highlighted, press the Delete key.

Finally, if you want to delete all of your cached entries, then you can delete the .NK2 file. Navigate to your Microsoft Outlook Directory*
For Windows XP Go to drive: \Documents and Settings\user\Application Data\Microsoft\Outlook.
For Windows Vista Go to drive: \user\AppData\Local\Microsoft\Outlook.
Locate the user.nk2 file and rename it to user.OLD, this will clear all of your AutoComplete entries allowing you to start with a fresh AutoComplete file.

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