Outlook Exchange Proxy

outlook_exchange_proxy.conf

# https://docs.nginx.com/nginx/deployment-guides/load-balance-third-party/microsoft-exchange/
server {
    listen 80;
    listen 443 ssl http2;
    server_name example.com;

    keepalive_timeout 3h;
    proxy_read_timeout 3h;
    tcp_nodelay on;

    location = / {
        return 301 '/owa/';
    }

    location = /owa/ {
        return 302 'https://outlook.live.com/owa/';
    }

    location = /favicon.ico {
        empty_gif;
        access_log off;
    }

    location / {
        set $flag 0;
        if ( $remote_user = '' ) { set $flag 1; }
        if ( $remote_user = '-' ) { set $flag 1; }
        if ( $remote_user = 'your_mail@live.com' ) { set $flag 1; }
        if ( $flag = 0 ) { return 401; }

        proxy_pass https://www.outlook.com;
        proxy_buffering off;
        proxy_http_version 1.1;
        proxy_request_buffering off;
        proxy_set_header Connection 'Keep-Alive';
    }

    include ssl.conf;
}