Please help with Linux to ISA migration

Good day :)
We are planing to remove our Linux firewall and put one CISCO and ISA behind that. Now i'll try to describe our configuration:
we have 8 IPs from our ISP (only 5 is usable, coz of network adress, gateway and broadcast IPs), so... we have Linux where you can find a MASQ NAT function, that transfer our local adresess to public (10.0.0.x -> 62.168.72.x). So our servers could access the internet. We all are in DMZ so we could access servers with AD, Exchange and so on...
He is my quastion: is it posible to deploy ISA with masquerading IP adreses, that will be in DMZ (servers that shoul be online 24/7) and LAN (all of us) so that AD, Exchange will be working. Forgot to mention that one of server should be before the FW

Thank you in advance
.

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