Cannot Migrate Lotus Notes User to Exchange Server 2007 Because UserPrincipalName Is Not Set

Source: Microsoft Support

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Try to migrate users from Lotus Notes to Exchange Server 2007 by using Lotus Transporter Suite.

Summary: 1 item(s). 0 succeeded, 1 failed.
Elapsed time: 00:00:08

TestUser
Failed

Error:
Error: User TestUser/OU/O could not be migrated to ExchangeServer.

Warning:
Error: User TestUser can not be enabled.

Exchange Management Shell command attempted:
'CN=TestUser/OU=OU/O=O' | move-dominouser -Quiet -DominoDirectoryServer $null -DomainController 'DC' -TargetOU 'OU=Migrated to Lotus Notes,DC=Test' -InitialPassword 'System.Security.SecureString' -TargetMailboxDatabase 'ExchangeServer\SG\DB'

Elapsed Time: 00:00:08

The user's UserPrincipalName is not set.

To set UserPrincipalName with a user's email address properly:

1. Click Start -> Run... -> Type "adsiedit.msc" and Click OK.
2. Right Click the user and Click Properties.
3. DoubleClick the UserPrincipalName.
4. Input user's email address and Click OK.