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This article describes two methods that you can use to give ownership of a Microsoft Exchange 2000 Server mailbox or of a Microsoft Exchange Server 2003 mailbox to a Microsoft Windows NT Server 4.0 user account. You can also use these methods to give ownership of a Exchange 2000 mailbox or of a Exchange 2003 mailbox to a Microsoft Windows 2000 Server account in another forest.
Typically, an Exchange 2000 mailbox or an Exchange 2003 mailbox is associated with a Windows 2000 user account. Exchange 2000 and Exchange 2003 use the Windows 2000 Active Directory directory service, and the mailbox is represented by a set of attributes on a user account instead of being its own directory object. However, you can configure a Windows NT 4.0 user account or a Windows 2000 user account in another forest to be associated with an Exchange 2000 mailbox or an Exchange 2003 mailbox.
This situation typically occurs when you migrate from Windows NT 4.0 and Microsoft Exchange Server 5.5 to Windows 2000 and Exchange 2000 or Exchange 2003. However, you can create a new Exchange 2000 mailbox or a new Exchange 2003 mailbox and configure a Windows NT 4.0 user account to be the account that is associated with that mailbox. This situation may also occur when Windows 2000 user accounts are in a separate forest from the Exchange 2000 mailboxes.
Move a mailbox from Exchange Server 5.5 to Exchange 2000 or Exchange 2003If your user accounts are still on Windows NT 4.0, but you have deployed Active Directory, you can use this method to give the Windows NT 4.0 user account (or Windows 2000 user account in another forest) ownership of an Exchange 2000 mailbox or an Exchange 2003 mailbox.
Note To follow these steps, you must have an existing Exchange Server 5.5 mailbox that is already associated to a Windows NT 4.0 account.
For more information about the Active Directory Connector, visit the Microsoft Exchange 2000 Server Upgrade Series Web page at the following Microsoft Web site: http://www.microsoft.com/technet/prodtechnol/exchange/2000/deploy/upgrademigrate/series/default.mspx
Associate an Exchange 2000 mailbox or an Exchange 2003 mailbox with a Windows NT 4.0 user account or with a Windows 2000 user account that is in another forestUse the following method to grant permission to access an Exchange 2000 mailbox or an Exchange 2003 mailbox to a Windows NT 4.0 account or a Windows 2000 user account in another forest.
Note You must establish a trust relationship between the Windows 2000 domain and the Windows NT 4.0 domain, or between two of the separate forest domains, before you complete these steps.
For additional information about how to programmatically associate an Exchange 2000 mailbox to a Windows NT 4.0 account, click the following article numbers to view the articles in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/304935/ )How to set Exchange 2000 mailbox rights at the time of mailbox creation
(https://support.microsoft.com/kb/310866/ )How to set Exchange 2000 mailbox rights on a mailbox that exists in the information store
Article ID: 278888 - Last Review: December 3, 2007 - Revision: 5.3