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Would that be an A Record in the DNS ?
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if the old server is gone already you can use an A record<br />
a CNAME record would work in either case
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if the old server is gone already you can use an A record
a CNAME record would work in either case

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It is better to create cname record for old server and to be pointed to new IP. 
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It is better to create cname record for old server and to be pointed to new IP.

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If the old SBS is online for some days, then the clients will automatically be redirected to the new exchange server without you having to do anything on the client
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If the old SBS is online for some days, then the clients will automatically be redirected to the new exchange server without you having to do anything on the client

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I am migrating from sbs 2003 to SBS 2008 onto new hardware using the Microsoft migration guide. 40 workstaions point to old server for exchange and sql databases. can i map the old name to the new name in dns or something so that i dont have to reconfigure all the workstations?
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I am migrating from sbs 2003 to SBS 2008 onto new hardware using the Microsoft migration guide. 40 workstaions point to old server for exchange and sql databases. can i map the old name to the new name in dns or something so that i dont have to reconfigure all the workstations?

SBS 2003 to 2008 migration - use old server name

Small Business Server (SBS) is a line of server operating systems targeted at small businesses by bundling the operating system with a number of other Microsoft products that would normally need to be purchased or licensed separately. The most notable inclusions are Exchange, SQL Server, SharePoint and ISA/TMG (Microsoft's firewall and proxy server).

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).

Windows Server 2003

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.