Export-Mailbox error approving object

I'm trying to run the export-mailbox cmdlet and keep getting an error:
StatusCode                       : -2147221219
StatusMessage                    : Error occurred in the step: Approving object. An unknown error has occurred.

The command I'm running is:
export-mailbox -id testuser -pstfolderpath C:\PSTFiles  -confirm:$false

I have confirmed that the account I'm running from has full mailbox permissions.  The servers and client both have the SP1 version installed.  The client is running Vista with Outlook 2007 installed.  The bottom of the log file generated looks like this:
[12/31/2008 4:16:57 PM] [0] [testuser] The operation has started.
[12/31/2008 4:16:57 PM] [0] [testuser] Initializing MAPI, loading library.
[12/31/2008 4:16:57 PM] [0] [testuser] Approving object.
[12/31/2008 4:16:57 PM] [0] [testuser] Logging on to the MAPI profile.
[12/31/2008 4:16:57 PM] [0] [testuser] Opening Exchange mailbox.
[12/31/2008 4:16:58 PM] [0] [ERROR] Error was found for Test User (testuser@company.com) because: Error occurred in the step: Approving object. An unknown error has occurred., error code: -2147221219
figgimicAsked:
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figgimicAuthor Commented:
Well that was kind of silly.  It turns out that the account you are using to perform the export-mailbox cmdlet must itself have an Exchange mailbox.  As soon as I set up a mailbox for my admin account, it started working.

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