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You can check below articles also, with all steps<br />
<a href="http://www.simple-talk.com/sysadmin/exchange/upgrade-exchange-2003-to-exchange-2010/" rel="ugc">http://www.simple-talk.com/sysadmin/exchange/upgrade-exchange-2003-to-exchange-2010/</a><br />
<a href="http://www.simple-talk.com/sysadmin/exchange/upgrade-exchange-2003-to-exchange-2010---part-ii/" rel="ugc">http://www.simple-talk.com/sysadmin/exchange/upgrade-exchange-2003-to-exchange-2010---part-ii/</a>
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You can check below articles also, with all steps
http://www.simple-talk.com/sysadmin/exchange/upgrade-exchange-2003-to-exchange-2010/ [http://www.simple-talk.com/sysadmin/exchange/upgrade-exchange-2003-to-exchange-2010/]
http://www.simple-talk.com/sysadmin/exchange/upgrade-exchange-2003-to-exchange-2010---part-ii/ [http://www.simple-talk.com/sysadmin/exchange/upgrade-exchange-2003-to-exchange-2010---part-ii/]

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I am trying to clarify a few points on our migration to exchange. We currently have three subnets all in one site. This is because all three subnets are connected via a 6mb circuit. Also...we don't really have a front end back end setup...one server in the main site has some registry hacks and is set up as a kind of fe/be dual role. That being said we have single 2003 box in each of three sites, Ill be building the cas/ht and mailbox server in the local site that is the ingress for our mail. <br />
1) when I create the CAS and HT part..do I need to create connections for each server<br />
2) when creating the legacy dns namespace how do I do that to each server?<br />
3) is TLS going to be mandatory on the smtp part?
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I am trying to clarify a few points on our migration to exchange. We currently have three subnets all in one site. This is because all three subnets are connected via a 6mb circuit. Also...we don't really have a front end back end setup...one server in the main site has some registry hacks and is set up as a kind of fe/be dual role. That being said we have single 2003 box in each of three sites, Ill be building the cas/ht and mailbox server in the local site that is the ingress for our mail. 
1) when I create the CAS and HT part..do I need to create connections for each server
2) when creating the legacy dns namespace how do I do that to each server?
3) is TLS going to be mandatory on the smtp part?

Exchange 2003 to 2010 migration questions

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.