Method 1 With Outlook 2010 open, click File (BackStage), and then click Options. Click the Mail tab. Under Send Messages, click Empty Auto-Complete List. Outlook will generate a new nickname cache. Method 2 Click Start, and then click Run. Start Outlook by using the /CleanAutoCompleteCache switch. For example: Outlook.exe /CleanAutoCompleteCache Note If Outlook is not …
