Do you want Outlook to suggest names while completing TO, CC, and BCC fields?
The autocomplete cache is stored in a *.nk2 file at “%UserProfile%\Application Data\Microsoft\Outlook”. You can delete the file to start fresh or use the arrow keys (as you are typing addresses in the fields) to select an address and use the Delete key to remove it.
To Enable/Disable Autocomplete in Outlook, try the following:
1. Open Outlook, click Tools – Options
2. Click “Email Options” button then “Advanced Email Options”
3. Check/Uncheck “Suggest names while completing To, Cc, Bcc fields” to enable/disable Autocomplete.
4. Click OK,OK, Apply & OK.
Group Policy or Startup scripts to disable from Windows Registry
If you are an organisation and want to enable/disable Autocomplete on all your network domain pcs the you can use Group Policy or Startup scripts to disable from Windows Registry
Look for the key “ShowAutoSug” key under
and set its value as follows
“0″ – Disable Autocomplete
“1″ – Enable Autocomplete
[NOTE: depending on Office version the registry path may vary for intstance as “10” or “11” in the above key]