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Upgrading from Windows Server 2003 to Windows Server 2007

I have a Windows Server 2003 environment (2 DCs, an Exchange Server (2003), and a Web Server).

Is it ok to purchase Server 2008 and perform an "upgrade" (if this is even an option), or better to do a fresh install and recreate the AD manually (adding groups, users, etc).

I have a very small network (5 users).  I'd prefer to do an upgrade, as it would save me from having to recreate the AD from scratch, but I would like to know what the best practice is.

Also, would upgrading effect my Exchange Server?

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2 Solutions
Jamie McKillopIT ManagerCommented:

You can certainly do an in-place upgrade, there is nothing wrong with that. Doing a "fresh" install of AD isn't really an option, especially with Exchange. You can build new Windows 2008 servers and add them as DCs in your current AD domain then decommission your old servers, if you want to start with new hardware and a fresh install.

As long as you are running Exchange 2003 SP2 or above, you can upgrade your AD to 2008.

Lee W, MVPTechnology and Business Process AdvisorCommented:
Are you using SBS?  If not why not?

I would not upgrade a server that has Exchange 2003 on it - I'm not sure if there are issues, but there's enough of a change that I wouldn't want to chance it.

If this is SBS, then you should be buying SBS 2008 and performing a migration.  (There are ways to relatively easily migrate the AD to a new server, even in an SBS domain.
Jamie McKillopIT ManagerCommented:
To clarify, I was talking about your domain controllers. You cannot upgrade to Windows 2008 on the Exchange server as Exchange 2003 will not run on Windows 2008.

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