Microsoft Outlook has some nice productivity features for email addresses called AutoComplete. The auto complete feature displays a drop-down list of suggestions based on what you typed when accessing any email address fields. It offers fast access, but sometimes the predictive text can suggest erroneous email addresses or interfere with how you work. Fortunately, you can correct bad entries and also turn the feature off.
Before we begin, Microsoft has made some changes to address suggestions. If you’re using Outlook 2016 or older with a POP3 email account, you probably have an “Nk2 ” file. This is a hidden file that is linked to a specific Outlook profile. This is sometimes called a nickname list or nickname cache. Don’t confuse this with the Nickname field on the Detail tab of a contact record.
Correcting Outlook Autocompletion Mistakes
It’s probably happened to all of us. In our rush to send out an email, we enter a bad email address. And these are often people not in our Contacts folder. The problem is the address will stay on this suggestion list until we fix
To correct Outlook nickname mistakes,
- Open an Untitled Message Window in Outlook.
- Type the first few letters, so the bad entry appears on the list.
- Highlight the item you wish to remove from the autosuggest list. You may need to use your directional keys to move up and down the list.
- Press your Delete key.
- Retype the correct entry in the address line and send the email.
When you close Outlook, your bad entry will be removed, and your corrected entry will be added.
How to Turn Off AutoComplete in Outlook
Some people find the auto-suggestions annoying.
If these items are of concern, you can turn this suggestion feature off.
- From the File tab, select Options.
- On the Outlook Options dialog, click Mail.
- Scroll down to the Send messages section
- Uncheck Use Auto-Complete List to suggest names
- (Option) If you wish to delete the list, click the Empty Auto-Complete List button.
- Click the OK button.
Tools to Read or Edit NK2 Files
Although some people are fearful of these files, they do offer benefits. If Outlook becomes corrupted, you may recreate contact records using the NK2 file as a source file. It won’t have all the contact details, but it’s a start. Or, if you’ve never created contacts and instead used AutoComplete to track your email addresses, the file is a good basis to build your Contacts. The file can also be copied to another computer.
One nice utility is from NirSoft because it also finds the Nk2 file location automatically. This can be an issue as the location and name change based on your Microsoft Outlook version and your operating system. The site also lists those file locations too.
AutoResolve Checks Email Addresses
AutoResolve is another convenience offered in Outlook but without concerns for hidden files. This feature checks the names you type on an outbound email to see if they match those in your Contact folder or address book. The intent is to prevent you from sending emails to people without email addresses or contacts with multiple email addresses.
In the example below, I typed the Dorothy Gale, rather than clicking the Send New Message to Contact icon on her record or using the To button. When I click the Check Names button, Outlook will try to resolve the name Dorothy Gale with the email addresses in my Contacts folder. In this example, Outlook is informing me that the name is not in my address book. I could create a new contact record.
This feature is also useful if you like to type partial names. In the example below Check Names is suggesting John Hancock based on my typing John H. I can then choose one of the listed email addresses or find another record.
Like AutoComplete, this feature is enabled from the same Outlook Options dialog. The option is called Automatic Name Checking.
As you can see, both AutoResolve and AutoComplete allow you to enter names or emails faster. You may find that one or both features serve your needs. The trick is knowing where the data comes from and how to act.
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