How to access Exchange Account from outside ADS from MS OUTLOOK

Dear Friends,

I have a task that to access MS Exchange account from outside ADS with MS outlook 2003. Now when I try to access i get error that Exchange is not available. Kindly can you tell me what is the issue with it. Or provide me any solution. Is there any port required or all systems should be on Domain ADS to access Exchange Accounts.
Waiting for solution.

Thankyou,

Regards,
Batman.
batman9Asked:
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rakeshmiglaniCommented:
have you configued RPC over HTTP..

this can be used if you are using Exchange 2003 and Outlook 2003

The "Exchange Server 2003 RPC over HTTP deployment scenarios" guide is available
http://support.microsoft.com/kb/840255/en-us

TechNet Support WebCast: An overview of RPC over HTTP in Microsoft Exchange Server 2003 and Microsoft Office Outlook 2003
http://support.microsoft.com/kb/888812/en-us

How to configure an RPC over HTTP topology on computers that are running Exchange 2003 with Service Pack 1
http://support.microsoft.com/kb/841652/en-us
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batman9Author Commented:
Actaully I am asking that I wannna access Exchange Account[not pop/imap] from my office computer[exchange server is on my home server]. Now which ports need to be opened and what I have to do. Because I want to share the features of calendar etc. I don't wanna use OWA. I wanna use MS OUTLOOK 2003 only and exchange account. Kindly provide me exact  details. In the scenario provided above, I need to have 2 exchange servers, I have only one and I want to access only that one from different locations with MS OUTLOOK 2003..
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rakeshmiglaniCommented:
you can configure RPC over HTTP even if you have a single exchange server.

Check the following article

How to configure RPC over HTTP on a single server in Exchange Server 2003
http://support.microsoft.com/kb/833401/en-us
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batman9Author Commented:
Can you tell me pls which ports on Exchange Server should be opened if behind firewall.
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rakeshmiglaniCommented:
Exchange 2000 Windows 2000 connectivity through firewalls
http://support.microsoft.com/kb/280132/en-us

TCP/UDP ports used by Exchange 2000 Server
http://support.microsoft.com/kb/278339/en-us

TCP ports and Microsoft Exchange: In-depth discussion
http://support.microsoft.com/kb/176466/en-us

Outlook cannot connect through a firewall or a proxy server that is performing Network Address Translation (NAT) between public and private networks in Outlook 2002 and Outlook 2003
http://support.microsoft.com/kb/291615/en-us

Support WebCast: Microsoft Exchange 2000 Server Connectivity Through a Firewall
http://support.microsoft.com/kb/324459/en-us
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