Autocomplete List stopped working in Outlook 2016

Autocomplete ListHi,

 I have an user whose Outlook client (connected to Exchange 2010) stopped populating email addresses automatically, all of a sudden today.
The user said it used to work until last week. When I checked RoamCache folder on this user's computer this morning, I saw several Autocomplete files with 1,074KB in size. It is strange that there are multiple Autocomplete files with the same size. Usually there should be one for each Outlook profile.

I understand that Outlook 2010 has a limit of 1,000 entries in Autocomplete file?

What is my solution here?

Thanks.
LVL 1
sgleeAsked:
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JohnBusiness Consultant (Owner)Commented:
Autocomplete works but can be damaged. Open Outlook, Options, Mail and Empty Autocomplete.  Restart Outlook and let Autocomplete start rebuilding.
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sgleeAuthor Commented:
"Open Outlook, Options, Mail and Empty Autocomplete" --> I will try that and report back.
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sgleeAuthor Commented:
@John
"Autocomplete start rebuilding." --> are you suggesting that the user starts rebuild the list from the scratch?
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JohnBusiness Consultant (Owner)Commented:
Yes. There is no middle ground. It works, or delete it and start from scratch. It rebuilds quickly. Inform your user to use Contacts as that helps build the Autocomplete list speedily.
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sgleeAuthor Commented:
@John
That was not the solution that I was looking for.
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JohnBusiness Consultant (Owner)Commented:
If Autocomplete is damaged, the only way to fix it is to start over.
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Shaun VermaakTechnical Specialist IVCommented:
Recreate the Outlook profile (not the Windows Profile)
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sgleeAuthor Commented:
I tried to create a new Outlook profile, but did not resolve the issue.
I ended up creating a new user profile.

Thank you for your help.
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sgleeAuthor Commented:
I found my own solution.
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