Imap to Exchange 2007 - Microsoft Transporter Suite 401 error

I am attempting to import email from Imap to Exchange 2007 using Microsoft Transporter Suite/Internet E-mail Migration Wizard. I keep receiving the following error:

The request failed with HTTP status 401: Unauthorized. It was running command 'Move-IMAPMailboxToExchange -AllowUnsecureConnection $true -TargetClientAccessServer 'MyExchangeServer' -GlobalCatalog "MyGlobalCatalog' -Quiet'.

Any suggestions would be great!
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RandyReichertAuthor Commented:
I used the shell option in Transporter Suite to attempt to manually migrate the mailbox with a debug switch. I found that it was hanging up on the EWS virtual directory. I enabled Digest Authentication on the EWS virtual directory in IIS. Migration was now successful.

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