Chuck Ze,
Unless your company uninstalled Classic Outlook it is probably still there. Normally you should be able to toggle back to Classic Outlook using the steps in this article, Toggling out of the new Outlook for Windows preview - Microsoft Support. However, you can also use both applications on the same time. I have both running most all of the time in my work.
Check if Classic Outlook is still there in folder, C:\Program Files\Microsoft Office\root\Office16. If so, you can start Outlook.exe and then right click on its icon and pin it on the task bar.
The New Outlook Team implemented drag and drop in March. You can monitor this page for status on top requests, Things to look forward to in the new Outlook for Windows - Microsoft Community Hub. I tested dragging email attachments to folders and that worked but dragging an email appears to still being perfected. Give it a try when you get a chance as it is always improving daily.