Outlook: Purge the AutoComplete List

This support article provides instruction how to purge the contact auto-complete within Outlook. This addresses issues that can occur when contacts within the auto-complete feature are corrupted. This is a known issue by Microsoft.

WARNING: This procedure clears all contacts within the Outlook Auto-Complete feature.
This does not remove any saved contacts within your Outlook account, but the cached
email addresses themselves. Exercise caution when performing this action.

Solution:

1. In Outlook, go to File > Options
   
   
   
2. Select the Mail category options, then click the Empty Auto-Complete List button
   
   
3. Restart the Outlook desktop app

This will purge and remove all cached contacts within the Outlook Auto-Complete feature.

Reference:

• The Outlook AutoComplete list