Outlook 2013 Autocomplete Function not working

Question

The autocomplete function in Outlook (when you start typing and it auto fills the email addresses) just will not work on this one mailbox. I have tried everything I can imagine including:

• Creating a new profile
• Ensuring all of the boxes are checked in the Options > Send mail settings
• Putting in both Cache and Online mode
• Moving the datastore where the Mailbox is located
• Renaming the Roamcache folder in the program data folder
• Renaming the Autocomplete .dat file
• Creating a new windows profile
• Trying both Office 2010 and 2013
• Trying on different computers

And the kicker, all of the autocomplete items are in OWA. I do not want to try emptying the "Empty Auto-Complete List" for obvious reasons. The infrastructure setup is Windows 7 Pro 64bit with Office 2013 Pro 64bit. The server is Windows 2008 R2 Standard with Exchange 2010 SP2. Everything is patched and up to date. I know that .nk2 files live on the server now with Exchange 2010 and the fact that I can see all the autocomplete entries (ones not in the GAL) makes me think something else is going on here.

Solution

So ultimately, I used NK2Edit from Nirsoft to export the AutoComplete entries to an .nk2 file. Then within outlook, I emptied the autocomplete entries from within outlook. Lastly, I put the .nk2 file in the c:..\Roaming\Outlook folder and ran "Outlook.exe /importnk2" and it imported all of the autocomplete entires back into outlook. Must have been a corrupt entry. Extremely annoying.

Comments

[George Bluff]

Just an update, I used NK2Edit to view the stream_autocomplete*.dat file and noticed there are more than 1000 entries. In Outlook 2013, the [HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Au‌​toNameCheck] which is in 2010 doesn't exsist in 2013.