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If Outlook stops responding at a screen that says "Processing," enter Safe Mode to solve Outlook 2016 not responding.
Step 1. Close Outlook.
Step 2. Launch it in safe mode.
For Windows 10: Click "Start" > "Search" > Type: Outlook.exe /safe and hit Enter;
For Windows 8: Open "Apps" menu > Select "Run" > Type: Outlook /safe and then click OK;
For Windows 7: Choose "Start" > Type: Outlook /safe in the Search programs and files box and then hit Enter.
Step 3. Close Outlook, and open it normally. After this, you could use Outlook 2016 in Windows 10 again.