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Theres no concept of and New or Additional Organization. All Exchange Server will be a part of an Exchange Organisation. There will be only 1 Exchange Organisation for the entire Organisation.<br />
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When you install the Exchange on the other domain, first run setup /domainprep and then install Exchange.<br />
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If the servers are in different locations and belong to different IP Subnets, then it is advisable to create Different Sites.<br />
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Refer to the below link for the replcation errors.<br />
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Once your AD sites are in place, create the Routing Group connectors<br />

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Are you saying that for the other domain, I will not need to run forest prep again because I have already done so for the 1st Exchange server in the forest? I will select &quot;installation for additional Exchange servers&quot; during Exchange Setup?
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Hi, I've a single forest with 2 domains. My 1st Exchange in Site A is setup as the 1st Exchange server in that forest. On my other domain in Site B, how shall I go about installing my Exchange 2003 ? Install as a &quot;new Exchange server&quot; or install as an &quot;additional Exchange Server&quot;? My purpose is to configure RGC between the 2 Exchange Servers.<br />
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Another question is configuring AD Sites and Services. Currently both servers are in Default first Site. Shall I create additional Sites based on location and move the servers according to their location? Are they suppose to replicate with each other? I tried to do a manual replication but it says something like permission denied. Am I missing something here? <br />
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THanks
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Hi, I've a single forest with 2 domains. My 1st Exchange in Site A is setup as the 1st Exchange server in that forest. On my other domain in Site B, how shall I go about installing my Exchange 2003 ? Install as a "new Exchange server" or install as an "additional Exchange Server"? My purpose is to configure RGC between the 2 Exchange Servers.

Another question is configuring AD Sites and Services. Currently both servers are in Default first Site. Shall I create additional Sites based on location and move the servers according to their location? Are they suppose to replicate with each other? I tried to do a manual replication but it says something like permission denied. Am I missing something here? 

THanks

Question regarding installing Exchange and AD Sites and Services Qn in a multi-Site Environment

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.