The "New Outlook" is just a re-badged version of Windows Mail, which also did not support merging to Email.
As a result, the introduction of the "New Outlook" is just the latest of Microsoft's SNAFUs
If you have the toggle at the top right of the Outlook WIndow, use that to turn off the "New Outlook"
If you do not see the toggle to turn off the new Outlook, you can cause it to be displayed by
Open Registry Editor using regedit command in RUN dialog box or Start Search box.
Go to the following key:
HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Preferences
Select the UseNewOutlook key and then click on Edit and then Modify and change the Value data from 0 to 1
- Go to the following key:
HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Options\General
- In right-side pane, create a new DWORD with the name HideNewOutlookToggle and set its value to 0
- Restart Outlook and Outlook will hang for a while before coming up with a message like "New Outlook had a problem starting" and then Outlook will start with the old style.
Restarting Outlook after that point should result in it starting the old style.