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You can use the following Microsoft Technet Article as a guide for installing Live Communication Server 2005. Remember, that before installing Live Communication Server 2005, you need:

1. At least one server with Windows 2003 & SP1 or Windows 2003 R2 (preferred).
2. Active Directory and DNS.
3. SQL Server 2000 & SP3a (Enterprise or Standard)

Install Live Communications Server 2005 Enterprise Edition

This brief guide assumes that you already have a domain controller configured with DNS, or a domain controller configured and a DNS server configured.

If required, you can install Microsoft Exchange 2003 and Active Directory (with DNS) on the same machine. Once you have your server (or servers) prepared, be sure to note down your domain name, and Administrator password.

http://technet.microsoft.com/en-us/library/a3318f57 … .aspx

Step 1 - Prepare a Server for Microsoft Exchange

Install Additional Windows Components

http://technet.microsoft.com/en-us/library/bb124295.aspx

Step 2 - Prepare the Forest for Microsoft Exchange

You will need to run the following command: setup /ForestPrep

http://technet.microsoft.com/en-us/library/bb124110.aspx

Step 3 - Prepare the Domain for Microsoft Exchange

You will need to run the following command: setup /ForestPrep

http://technet.microsoft.com/en-us/library/aa997526.aspx

Step 4 - Install Microsoft Exchange

http://technet.microsoft.com/en-us/library/bb124186.aspx