Issues With New Outlook

Hi I have been happily using Windows Mail as Outlook doesn't support my Exchange email account. Recently I have been forced to the New Outlook with no toggle button to return to Windows Mail. This now renders my email useless. Is there any way to return to Windows Mail that was working perfectly until a few days ago? 

Secondly I have a paid lifetime subscription to Office Professional and object to having to pay for a 365 subscription to get rid of ads on the New Outlook when I already paid for Outlook on my Office Pro subscription. Is there a workaround? 

TIA for any suggestions.