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How can we move our NT4 Exchange 5.5 server to new hardware?

We have a Windows NT 4.0 server that is also our primary domain controller (PDC). On this, we have Exchange Server 5.5 with Service Pack 4 installed. This machine is frequently going down due to internal hardware controller failure, so we want to shift this Exchange Server to another machine. Right now, we have no plans to move to Windows 2000 or Exchange 2000. Can you please suggest some possible ways of shifting this Exchange server to new hardware? (Exchange server is on the PDC. We have a BDC to support.)
Moving Exchange onto new hardware is a pretty simple process. Generally, you'll want to build a new server (preferably a member server and not a domain controller) running Windows NT Server 4.0 and Exchange 5.5. (I recommend installing the latest service packs and security updates for Windows and Exchange.) Be sure to join the Exchange Org and the same Site as the existing Exchange server.

Then move the mailboxes from the old server to the new one, rehome your public folders (see How to rehome public folders). Then, follow the instructions in How to remove the first Exchange server in a site.

You may want to leave the original server up for a little bit so that your Exchange clients can be redirected to their new mailbox store.

Dig Deeper on Exchange Server setup and troubleshooting

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