These guides didn't help me.
What is the error on the client side?
I'am using an "Exchange" connection type.
An error after connection attempt:
Any logs/errors on Exchange server?
I record traffic using wireshark which is installed to Exhange machine at the time of connection. I don't see any attempts to access Exchange from the IP addresses of the external workstation or the internal ip address of the Check Point.
Are you using OWA or something else?
Yes, we can try to connect to OWA through external IP address of Check Point. Connection attempt failed from the Outside_PC station.
What HTTPS logs above say?
These are logs at the time of connection from the workstation Outside_PC with Outlook.