Outlook 2013 autocomplete stops working. Outlook works fine otherwise.
Probably nickname cache corruption.
You can use NK2Edit to fix a corrupt nickname cache file.
- Have Outlook open.
- Download and install NK2Edit from http://nirsoft.net/utils/outlook_nk2_edit.html
- When prompted run it. It will automatically open your nickname cache file and prompt you about the total entries versus good entries.
- Close Outlook.
- Save your nickname cache file (default save.)
- Reopen Outlook and confirm your autocomplete now works.