Calendar For External Users

I have a few users who get their email from an Exchange 2003 server using POP3. They rarely ever come into the office. Now they want to be able to use the calendar in Outlook on their local machines and share the calendar data with internal users.
The internal users just log in and open outlook because it is on their local network.

How can this be done? VPN, or is there some other solution?
LLaurent06Asked:
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redseatechnologiesConnect With a Mentor Commented:
Hi LLaurent06,

Get your users of POP3 altogether.

You should be using RPC/HTTP.  It will give your remote users the same access as if they were in the office, without having to mess around with a VPN.

Here is info about it -> http://www.microsoft.com/technet/prodtechnol/exchange/2003/library/ex2k3rpc.mspx

Here is how to do it -> http://www.amset.info/exchange/rpc-http.asp

Hope that helps,

-red
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LLaurent06Author Commented:
Red, I looked at RPC over HTTP, but I only have one Exchange server. Can it be configured with one Exchange server behind a PIX firewall?
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SembeeCommented:
Someone else who thinks that RPC over HTTPS cannot be used on single servers.
That is not the case. The only problem with using on a single server is that you must make the registry changes yourself - it isn't automatic.

Simon.
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redseatechnologiesCommented:
There is a lot of misinformation out there about RPC/HTTPS - the need for multiple servers is one (MS aren't even very clear on that), and the other big one is that machines have to be on the LAN for the first logon (which is purported by a few too many (respected) people).

-red
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