Exchange migration wizard failed to open message errors

[freebsdboy]

Using exchange migration wizard to test migrate email to our test server(zimbra 5.0.9 network edition. I see several errors when migrating an email box. Like
Failed to open message error (8004010f) eid( some huge hex number)

Get this message more than 5 or 6 times on a mailbox and the migrate stops.

Whats the error mean? How do I track down what its error on?

Migration wizard 5.0.2 (this is the only version that doesn't have the massive UID[.. errors)

thanks