How we can check Microsoft ISA Server 2006 Version: 5.0.5723.514 is standard edition or enterprise edition

hi,

we are using  Microsoft  "ISA Server 2006 .Version: 5.0.5723.514".

But how we can check it is ISA Server 2006 standard edition or a enterprise edition.

And how we can check its END OF LIFE AND   END OF SUPPORT dates.

thanks and regards,

Ravi