What is the preferred placement for a OWA front-end server given these
two possible network configurations and why?

1) [Internet] <==> [PIX Firewall] <==> [ISA Proxy] <==> [PIX Firewall]
<==> [OWA] <==> [Internal Net w/Exchange Svr]

2) [Internet] <==> [PIX Firewall] <==> [ISA Proxy] <==> [OWA] <==> [PIX
Firewall] <==> [Internal Net w/Exchange Svr]

Notes:
The ISA server is performing a reverse proxy for HTTPS connections.
In #1, the backend firewall will only allow port 443 through to OWA.
In #2, all ports required for OWA to communicate with the internal
exchange server is allowed.
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