Upgrade server 2000 to server 2003, exchange 2003 does not work any more


I have upgraded a server from server 2000 to server 2003 but the exchange 2003 on the server does not work any more. Can i do a re-installation of exchange 2003 enterprise. Will i lose anything?  will all be well again?

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NJComputerNetworksConnect With a Mentor Commented:
Exchange 2000 is not supported and will not work loaded on the Windows 2003 operating system:

Can I run Microsoft Exchange 2000 Server on Windows Server 2003?

In a word, no. The Microsoft article "XADM: You Cannot Install Exchange 2000 on a Computer That Is Running Windows Server 2003" (http://
support.microsoft.com/?kbid=321648) states that you can run Exchange 2000 only on a Windows 2000 server. However, Exchange 2000 Service Pack 3 (SP3) and later can run in mixed Windows 2003 and Win2K environments with Windows 2003 domain controllers (DCs).

I don't think there is an easy fix for this problem.  You best bet is to use your backup tapes from before the upgrade and restore the OS and data.  This will bring your environment back to Windows 2000.  

Then follow these instructions for upgading to Exchange 2003 first before updating the OS:  http://www.msexchange.org/tutorials/Migrating-Exchange2000-Exchange-2003-Hardware.html

SembeeConnect With a Mentor Commented:
One of the reasons I don't recommend an inplace upgrade is because of problems like these.
As long as the Exchange installer detects the existing installation a reinstall will be fine. It will leave the data alone and just refresh the application. Remember to reinstall Exchange SP1.

If the install doesn't pick up the original install then I would abort the process and backup the files before going any further.

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