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IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/256986/EN-US/ )Description of the Microsoft Windows Registry
When you use User Manager for Domains functions of Microsoft Exchange Server, such as Migration Wizard and the creation of new mailboxes, may stop responding after you install and run Outlook 2000.
When you attempt to create mailboxes by using User Manager for Domains, you may receive the following error message:
An unexpected, unknown error has occurred.
MAPI or an unspecified service provider. ID no. 8004010f-0000-00000000
This behavior can occur, and this error message is generated, because Outlook 2000 has overwritten the Mapi32.dll. Although User Manager functionality, such as creating Windows NT accounts and assigning groups, functions as expected, the Exchange Extension reports a MAPI error when you attempt to create a mailbox as part of the new account process.
NOTE: The Exchange Administrator program is able to create mailboxes and associated Windows NT accounts as expected.
Outlook 2000 recognizes the previous version of the Mapi32.dll file and wants to change it. When you start Outlook 2000, Outlook verifies that the Mapi32.dll file in the system directory is the stub .dll that Outlook 2000 originally installed. If Outlook detects that the current Mapi32.dll is not the stub version, Outlook displays an error message or displays no user interface (UI) and behaves according to a registry key that can be set.
WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
To work around this behavior, reinstall Admin.exe, which installs the version of Mapi32.dll necessary to resume Exchange Server functions, and then add the FixMapi registry key so that Outlook does not run FixMapi. To do so:
When the Microsoft Exchange Migration Wizard stops responding and does not function because of an incorrect Mapi32.dll, the following event ID messages are logged in the Application event log:
Event ID : 10,000
Could not create a profile for Account: Username at XXX. Please reboot your system to clear hung profiles.
Event ID: 7026
Migration Aborted due to Mapi logon failure.
Event ID: 8002
Errors occurred during the Migration Process. A recovery file has been created called D:\TEMP\00000000.PRI.