Outlook 2016 nk2 file not updating
NK2 extension that is linked to a specific Outlook profile.The autocomplete feature is available by default on the Advanced E-mail Option dialog.Autocomplete: Outlook caches the previous address and needs to be cleared before the new correct Office 365 addresses will be added to the autocomplete list.To remove a single address from the Auto Complete list, use the arrow keys to select it and press the Delete key.On your advice, I unchecked it then checked it again and - voila - autocomplete is working again with all my old email addresses so I dont have to go thru the painfully slow rebuild and I dont have to fool around with that file thing.
Check out Microsoft's FAQs for Office 365 (https://support.office.com/).
Outlook 2013 no longer uses an nk2-file for caching but stores these addresses in the Suggested Contacts folder in the Outlook mailbox itself.
When you upgrade to Outlook 2013, the nk2-file is automatically imported upon starting Outlook 2013 for the first time.
Synchronizing your Outlook (cached) address book with the Global Address book may fix these discrepancies.
Instances of mail that is bounced back to the sender may also be fixed.
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The main difference between the two is where they look for the information.