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If you add the new server to your existing infrastructre then MOVE the mailboxes to it using the AD/Exchange Task tool; Outlook will automatically reconfigure itself.
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If you add the new server to your existing infrastructre then MOVE the mailboxes to it using the AD/Exchange Task tool; Outlook will automatically reconfigure itself.

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If old server is running in the environment then outlook try to connect to that old server and old server redirect the request to new server where mailbox currently available and update the outlook profile with new server automatically.
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If old server is running in the environment then outlook try to connect to that old server and old server redirect the request to new server where mailbox currently available and update the outlook profile with new server automatically.

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So you are saying for it to reference to the new server the old one will have to be operational still?
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So you are saying for it to reference to the new server the old one will have to be operational still?

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What version Exchange and Outlook are being used presently?
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What version Exchange and Outlook are being used presently?

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We are currently in the process of moving our exchange to a new server. We would like to have the smallest impact on users but also don't want to be going from computer to computer to change the users mail settings to look to the new exchange server. Is there a way to globally make this change to hit as many clients in one shot? 
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We are currently in the process of moving our exchange to a new server. We would like to have the smallest impact on users but also don't want to be going from computer to computer to change the users mail settings to look to the new exchange server. Is there a way to globally make this change to hit as many clients in one shot? 

Changing the exchange server on numerous computers

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.

Exchange

An email client, email reader or more formally mail user agent (MUA) is a computer program in the category of groupware environments used to access and manage a user's email. A web application that provides message management, composition, and reception functions may internally act as an email client; as a whole, it is commonly referred to as webmail. Likewise, email client may be referred to a piece of computer hardware or software whose primary or most visible role is to work as an email client. Email clients can also have other systems, like calendars, notes and contact managers.