Event ID - 7026

Event Id7026
DescriptionMigration Aborted due to Mapi logon failure.
Event InformationAccording to Microsoft:
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.
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:
1. Browse to the following registry key:
2. On the Edit menu, click New, and then click DWORD Value.
3. Name the new DWORD Value, FixMAPI.
4. On the Edit menu, click Modify.
5. Click Decimal, in the Base section, type 0 in the Value Data box, and then click OK.
6. On the Registry menu, click Exit.
You are able to run Outlook 2000, the Migration Wizard, and User Manager to create mailboxes without conflict.
Reference LinksXFOR: Exchange Migration Wizard Does Not Work with Event ID 7026

http://support.microsoft.com/default.aspx?scid=kb;en-us;182665" target="_blank">XADM: Exchange Migration Wizard Fails with 7026 error

XFOR: SFS Mail Not Migrated When Custom Recipient Is Converted

XFOR: Exchange Migration Wizard Stops Responding After You Use Outlook 2000

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