outlook.conf

# nginx@nginx:~$ cat /etc/nginx/sites-available/outlook.conf

server {
        listen 192.168.128.2:80;
        server_name yourdomain.com;
        return 301 https://yourdomain.com$request_uri;
}

server {
        listen       192.168.128.2:443;
        server_name yourdomain.com;
        set $exchange2016 https://192.168.128.112:443;

        # Redirect from "/" to "/owa" by default
        rewrite ^/$ https://yourdomain.com/owa permanent;

        # Enable SSL
        ssl                     on;
        ssl_certificate         /etc/letsencrypt/live/yourdomain.com/fullchain.pem;
        ssl_certificate_key     /etc/letsencrypt/live/yourdomain.com/privkey.pem;
        ssl_session_timeout     5m;

        # Set global proxy settings
        proxy_pass_request_headers on;
        proxy_read_timeout      360;

        proxy_pass_header       Date;
        proxy_pass_header       Server;

        proxy_set_header        Host $host;
        proxy_set_header        X-Real-IP $remote_addr;
        proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;

        location ~* ^/owa      { proxy_pass $exchange2016; }
        location ~* ^/Microsoft-Server-ActiveSync { proxy_pass $exchange2016; }
        location ~* ^/ecp { proxy_pass $exchange2016; }
        location ~* ^/Rpc { proxy_pass $exchange2016; }
        #location ~* ^/mailarchiver { proxy_pass https://mailarchiver.local; }
        error_log /var/log/nginx/owa-ssl-error.log;
        access_log /var/log/nginx/owa-ssl-access.log;
}

server {
        listen       192.168.128.2:443;
        server_name autodiscover.yourdomain.com;

        # Enable SSL
        ssl                     on;
        ssl_certificate         /etc/letsencrypt/live/autodiscover.yourdomain.com/fullchain.pem;
        ssl_certificate_key     /etc/letsencrypt/live/autodiscover.yourdomain.com/privkey.pem;
        ssl_session_timeout     5m;

        # Set global proxy settings
        proxy_pass_request_headers on;
        proxy_read_timeout      360;

        proxy_pass_header       Date;
        proxy_pass_header       Server;

        proxy_set_header        Host $host;
        proxy_set_header        X-Real-IP $remote_addr;
        proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;

        location ~* ^/Autodiscover { proxy_pass $exchange2016; }

        error_log /var/log/nginx/owa-ssl-error.log;
        access_log /var/log/nginx/owa-ssl-access.log;
}