Connecting to Exchange Remotely

I need end-users to be able to access Exchange 2007 remotely w/out putting the box online.  Connecting to it after VPN'ing in isn't exactly what I had in mind.  Is there a way to accomplish what I want to do?  I found this article...

http://www.microsoft.com/technet/community/columns/secmvp/sv0405.mspx

If this will work for my purposes, can someone please step me through what exactly I need to do on this end to set it up properly?  Thank you much.
jmg999Asked:
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SembeeCommented:
ISA is not my strong point at all. You may want to post a pointer question in the ISA zone so the ISA experts can contribute.

Simon.

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SembeeCommented:
If you don't want to directly expose an Exchange server then an ISA server in front will be perfect for the job. That is actually how Microsoft would prefer that you deploy it. Use ISA 2006 though, not 2004.

Simon.
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jmg999Author Commented:
Is the ISA server run on the same rig as Exchange, or is it a separate box?
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jmg999Author Commented:
So, I found this...

http://www.microsoft.com/technet/isa/2006/deployment/exchange.mspx

My question is this: We're running a single Exchange 2007 server.  It's in sort of an odd setup.  Initially, we used PostFix.  Therefore, the only MX record for our domain pointed to our Barracuda spam filter, which then passed the mail to PostFix.  Now, w/ the implementation of Exchange, PostFix passes the mail to Exchange.  Is the setup of ISA going to be any different b/c of this?
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SembeeCommented:
You don't have to publish everything for Exchange through ISA.
The most common use I do ISA for (well normally watch someone else do it as I am working on Exchange) is for OWA. SMTP email comes in via another gateway, usually something separate.
Therefore in this scenario you are only looking to publish CAS roles.
In effect, your appliance/s (ie not the Exchange servers) are doing the same thing as an Edge Server.

Simon.
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jmg999Author Commented:
Hi Simon,

Thanks for the reply.  I'm currently trying to configure ISA, but this is the info in the link I'd posted above...

Publish a Mail Server to Receive Internet E-Mail Messages

In this section, you will run the New Mail Server Publishing Rule Wizard to publish an SMTP mail server. Perform the following procedure to publish the SMTP mail server.
To publish a mail server

1.
      

In the console tree of ISA Server Management, click Firewall Policy:

I don't know where to find the New Mail Server Publishing Rule Wizard, nor can I find an .msc for ISA Server Management on the Exchange Server.  Any suggestions?  Thank you.
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jmg999Author Commented:
Thank you, Simon.
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