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We have a current Exchange 2003 server running on server 2003, we will be transitioning over to exchange 2007 w/sp1 on server 2008. &nbsp;Everything is prepped but we are stuck at the exchange install saying that a reboot is required from a previous installation. &nbsp;The server has been rebooted, all updates have been installed and rebooted, the main 2003 DC and exchange server have been rebooted. &nbsp;I have seen posts pointing to a KB article for 2000 machines but it does not exist any longer. &nbsp;Help getting beyond this would be great.
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We have a current Exchange 2003 server running on server 2003, we will be transitioning over to exchange 2007 w/sp1 on server 2008.  Everything is prepped but we are stuck at the exchange install saying that a reboot is required from a previous installation.  The server has been rebooted, all updates have been installed and rebooted, the main 2003 DC and exchange server have been rebooted.  I have seen posts pointing to a KB article for 2000 machines but it does not exist any longer.  Help getting beyond this would be great.

Exchange 2007 w/sp1 Install on server 2008 Reboot required but has been done

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.

Windows Server 2008

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.