Revert Outlook 2016 Autocomplete replaced with Recent People.

To Fix this annoying problem go into click on start + run or Windows key + R or click on start and type regedit.

Once in the registry go to 

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HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Option 

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and right click create new dword and name it DisableAutoCompleteUpdate

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then modify it giving it a HEX value of 1 

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Restart your outlook.!