Clear Outlook automplete
https://www.technipages.com/outlook-cle ... plete-list
- Close out of Outlook.
- Hold down the Windows Key and press “R“.
- Type “C:\Users\%username%\AppData\Local\Microsoft\Outlook\RoamCache†then press “Enter“.
- Delete the “.DAT†file that starts with “Stream_Autocomplete“. The file will recreate later, but shouldn’t have any old stored email address data any longer.