New Exchange 2010 server

We're in the process of attempting a migration from Exchange 2003 to Exchange 2010 over one of the next weekends. As this is my first attempt at a migration I wanted to mess up as little as possible.

I found a step -by-step walk though which I'm going to follow but wanted to know if installing the new server with a typical exchange server install along with Client access role mail.xxx.com and mail flow setting will effect my current users/server?

I'd like to get the new software installed so that I can start to look around in it but not at the expense of causing problems for my users.
dak11Asked:
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Simon Butler (Sembee)Connect With a Mentor ConsultantCommented:
Yes, as soon as the server comes up, it changes things.
Two areas can cause problems.

1. Mail routing - if you do not have an SMTP Connector in Exchange 2003, then Exchange 2010 takes over routing. Easily resolved by ensuring that you have an SMTP connector in Exchang 2003 before installation.

2. Autodiscover - if you have Outlook 2007 and higher clients, then they will start getting information autodiscover immediately.
http://blog.sembee.co.uk/post/Introduction-of-a-New-CAS-Server-Causes-Certificate-Prompts.aspx

There is no need to do the migration over a weekend - it can be done with zero downtime during production hours.

Simon.
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R--RCommented:
you can try this from Milind Naphade.
rapid-transition-guide-from-exch.pdf
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David CarrCommented:
You should also stop and the disable Client Access and Transport services on the new server until you can get the trusted certificates installed. that way you will prevent Outlook clients from hitting it.
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dak11Author Commented:
Thanks guys.

Just starting on the process now.
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