Microsoft Outlook maintains a nickname list that is used by both the automatic name checking feature and the automatic completion feature. The nickname list is generated automatically as you use Outlook. If the nickname cache is corrupted, Outlook may be unable to identify recipients, may offer incorrect recipients when automatically completing the email address, or may send the message to the wrong person.
Unlike earlier versions of Outlook that store the nickname cache in a file on your computer, Outlook 2010 stores the nickname cache in your primary message store. For example, if you are using a Microsoft Exchange Server account, your nickname cache is stored in a hidden message in your mailbox.
Type the first few characters of the nickname cache entry that you want to remove from the cache.
When the entry appears in the list of suggested names, use the UP and DOWN arrow keys on your keyboard to select the entry, and then press DELETE on your keyboard.
How to clear the whole nickname cache
To have us clear the whole nickname cache for you, go to the "Fix it for me" section. If you prefer to fix this problem yourself, go to the "Let me fix it myself" section.
Fix it for me
To fix this problem automatically, click the Fix it
button or link. Click Run
in the File Download dialog box, and follow the steps in the Fix it wizard.
This wizard may be in English only, but the automatic fix also works for other language versions of Windows.
If you are not on the computer that has the problem, save the Fix it solution to a flash drive or a CD and then run it on the computer that has the problem.
Click Organize, and then click Folder and search options.
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On the View tab, click Show hidden files, folders, and drives.
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Click OK.
Click Start, click All Programs, click Accessories, and then click Run.
In the Run dialog box, type the following command (including the quotation marks), and then click OK: “C:\ Users\UserName\AppData\Roaming\Microsoft\Outlook”
NoteUsername in this path is the name of the currently logged on Windows user.
Right-click the .NK2 file that has name of the profile that you want to reset, and then click Rename.
Rename the file as profilename.bak, and then press Enter.
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