RESOLUTION:
Disable SSL in MNE Console if not used:
- In MNE console, under "Exchange Server"
- Go to "Exchange Proxy Settings"
- Under "Proxy Authentication Settings"
change first the "Basic Authentication" to NTLM Authentication"
- Unselect "Connect using SSL only"
see also:
https://support.quest.com/migrator-for-notes-to-exchange/kb/202616