some newbie questions about isa

we have a load balanced environment with two isa enterprise server 2004. we use isa only as a proxy. we would like to publish owa/oma and active sync.

Is it correct, hat we can not publish all three services (oma, owa and as) over one internet domain ? for example www.mobile.company.com

My Problem is, that I can't create a second listener on port 443. I know there are some workarouns, but it seems that these workarounds do not work in a loadbalanced environmatent. Am I wrong?

Do I need a second listener for AS ? If I want to use OWA, OMA and AS ?


thanks
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