Need help with exchange 2013 "nk2" file

Im running exchange 2013 with outlook 2010.. When we updated to exchange 2013 I did the import nk2 to bring users "autofill" in for outlook. I had a user call me today stating his auto fill is gone, outlook created a new one for him. I had him close out outlook then I restored all of his outlook files from the weekend back up to his profile trying to correct this but it didnt, he still had the same autofill entries (5) he started to build after the old list disappeared.  What is the "nk2" file named in exchange 2013 and where is it stored? How can I get it back?
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JohnBusiness Consultant (Owner)Commented:
Outlook 2010 does not use an NK2 file. That stopped with Outlook 2007. Outlook 2010, 2013 and 2016 use Stream Autocomplete files.  Here is the Microsoft article with locations of the files and moving them.
bankadminAuthor Commented:
Thanks John, the article doesnt really address what Im trying to do. That article pertains to what I did 2 years ago when I imported users nk2 files into outlook 2010. I probalby wasnt clear before;
I had a user call me said he doesnt have any autofills in his outlook anymore in fact it started rebuilding he autofills from scratch.
I would like to restore his files from a backup if possible, I tried to do that but it didnt work he still has the new autofill list.
Is there a file that I can restore from a backup that would give him his autofill list?
JohnBusiness Consultant (Owner)Commented:
If you had Outlook 2007 on a machine and upgraded it to Outlook 2010, you can (one time I think) import the old NK2 file and Outlook 2010 will set it up as Stream Autocomplete.

I am not sure you can do this over again years later. Also if he / Outlook started on a new Stream Autocomplete, then it is probably too late and the user must use the new one.

I keep my Contacts up to date and so it is really (really) easy to build a new Autocomplete file.

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bankadminAuthor Commented:
I also recommend to all our users they save there contacts but most dont.
Seth SimmonsSr. Systems AdministratorCommented:
What is the "nk2" file named in exchange 2013 and where is it stored?

it is within the exchange database; else in a pst file if not using exchange

All updates to your nickname cache in Outlook 2010 are made to the hidden message in your default message store.

How to import .nk2 files into Outlook 2010

How can I get it back?

have you tried importing it again recently?
bankadminAuthor Commented:
We use exchange so I would assume that file became corrupted on the exchange server. So is my only option to reimport the nk2 file that i have from the original migration?
bankadminAuthor Commented:
I've requested that this question be deleted for the following reason:

Question not resolved
Seth SimmonsSr. Systems AdministratorCommented:
your questions in the original post were answered
you did not answer or attempt my last question
ModalotEE ModeratorCommented:
I've requested that this question be closed as follows:

Accepted answer: 250 points for thinkpads_user's comment #a40997829
Assisted answer: 250 points for thinkpads_user's comment #a40998125

for the following reason:

Lacking any further input the selected comments are best-effort answers.

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