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Outlook address auto complete going to wrong email address

Posted on 2016-08-24
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Last Modified: 2016-09-17
We moved our student email accounts to a new domain hosted by Google (students.uppervalleycc.org)  Last year's students had an account on our local Exchange server (uppervalleycc.org).  This year when a teacher tries to email a student who was here last year even if they key in their students.uppervalleycc.org email address it auto completes to their old uppervalleycc.org email account.  We did not delete the old Exchange accounts in case a student needed to get access to an old email.  We did update their AD accounts to reflect their new email address.
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Question by:bowsere
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by:Alexei Kuznetsov (Outlook MVP)
Alexei Kuznetsov (Outlook MVP) earned 1000 total points (awarded by participants)
ID: 41769356
Try to remove old address from autocomplete list by clicking the "X" next to the address in the dropdown list. After that add it using "To" button by selecting from address book.
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Expert Comment

by:FOX
ID: 41769358
You want to delete the old .n2k file or rename it to .old on the workstation.
Control Panel>Folder Options> enable hidden files and folders then navigate to

C:\Users\username\AppData\Roaming\Microsoft\Outlook  rename the .n2k file

The teacher should now start finding the students with the To:  
Once she starts populating her emails with the correct email addresses, these will be saved in the new autocomplete.
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Expert Comment

by:pjam
ID: 41769363
Or if you have an NK2 file you can use NK2Edit from nirsoft to edit.  Otherwise the first two suggestions are solid.  I would just X and enter new address from global address book.
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CompProbSolv earned 1000 total points (awarded by participants)
ID: 41769413
Deleting the .nk2 file will get rid of all of the autocompletes, but that file went away in newer versions of Outlook (2010 and newer, I believe).  There is a way to get rid of the autocompletes in the newer versions as described in: http://www.slipstick.com/outlook/email/understanding-outlooks-autocomplete-cache-nk2/

The easy method is to use File, Options, Mail, Empty Auto-Complete List from within Outlook.
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Author Comment

by:bowsere
ID: 41775158
Thanks all, we ended up having our end users clear the Auto Complete through their Outlook 2013 client.  We also ran a powershell script in Exchange to force an update to the global address list and offline address book.  These steps appeared to have resolved the issue.
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by:Alexei Kuznetsov (Outlook MVP)
ID: 41802894
Seems like emptying auto-complete fixed the issue.
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