Your cost saving up front may be lower with Windows but I would bet a lot of money you would regret the decision.  Unix is much more reliable and stable.  My experience with Windows servers is that if you don't reboot every week your in trouble.

I run a lot of critical interfaces on AIX.  We decided on AIX up front even though the initial cost was higher.  We all sleep at night and the interfaces are not a concern.  It runs for months on end before I reboot.

My philosophy is if there is an alternative to Windows servers, take it.  At least until Microsoft shapes up in the world of memory management and security.

Thanks for replying, I had hoped for more responses on this subject.

Are you running in any kind of failover mode in AIX and what release of egate are you running?

Thanks again.

I'm working to implement IBM HACMP with my two new AIX hosts.  I've posted another thread entitled "Installing 2 AIX hosts for high availability / redundancy" I'm looking for input on how to get to an active-active failover so I can utilize both boxes all of the time.

Runnin egate 4.5.3.  I'm planning to look at 5.0 in the next year.