Is there a simple method to upgrade the data from Exchange 5.5 on NT4 to Exchange 2000 on Windows 2000?
While I don't have the details of your specific environment, the simple answer is yes. Assuming your existing hardware is on Microsoft's Hardware Compatibility List (see http://www.microsoft.com/whdc/hcl/default.mspx) for Windows 2000, you can perform an in-place upgrade of Windows NT to Windows 2000, and then perform an in-place upgrade of Exchange 5.5 to Exchange 2000. If your system is not on the HCL, or if there are other factors that prevent you from performing an in-place upgrade, then your option is to build a new Windows 2000 server and then install Exchange 2000 on that system and into the existing Exchange organization. Of course, this is a very basic answer. You also need Active Directory and other pre-requisites. Therefore, I recommend you check out the documentation on Exchange 2000, particularly the documents related to deployment at http://www.microsoft.com/exchange/techinfo/deployment/2000/default.asp.
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