<VirtualHost *:80>
  ServerName  example.com 
  RewriteEngine On
  RewriteRule "^/$" "https://example.com/SOGo" [R,L]
</VirtualHost>

<VirtualHost *:443>
    ServerName example.com
    SSLEngine on
    SSLCertificateFile "/etc/httpd/ssl/example.com-2015-2016.cer"
    SSLCertificateKeyFile "/etc/httpd/ssl/example.com-2015-2016.key"
    RewriteEngine On
    RewriteRule "^/$" "https://example.com/SOGo" [R,L]
</VirtualHost>

