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Where is your Exchange 5.5?
It\'s in PDC or BDC? I don\'t think you will install Exchange 5.5 in PDC, so you can do the following things:
1. Clone your harddrive of PDC and keep it in case when you fail to upgrade you can use the cloned harddrive to switch back
2. Do you have DNS? Does it support Active Directory? If not, you must install a DNS server and you also must use a fully qualified DNS name like YourServer.YourCompany.com. Once you use it in Active Directory, you can never delete/change it unless you uninstall the Active Directory completely
3. Upgrade PDC from winnt 4 to win2k. After the OS is upgraded successfully, the DCPROMO command will run automatically to upgrade domain to Active Directory |
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