DUS : Invalid or nonexistent document

Hello,

I am prepairing the migration from Exchange 5.5 to Domino. When trying to move a mailfile (user already registered), here is the error I get. I tryed both 5.13 and 6.5.4 admin client and my Domino server is a 5.0.11. The migration process does start and several calendar entries are added to the Notes mailbox, but it fails before moving mail documents.

Any help greatly apreciated!!!

04/07/2005 05:57:48 PM Client Execution Security is enabled.

04/07/2005 05:57:51 PM Event Monitor started

04/07/2005 06:03:16 PM Notifying the current DUS (Domino Upgrade Services) application that registration is about to begin…

04/07/2005 06:03:21 PM Registration completed. Now converting mail file for Jane Doe…

04/07/2005 06:03:37 PM

Exchange Migration: Unable to add note to folder for message with subject ‘IT projects and priorities, Helpdesk job status’, in folder ‘($Calendar)’. Error message: Invalid or nonexistent document

04/07/2005 06:03:39 PM

Exchange Migration: User Jane Doe migrated. 0 message(s) converted.

04/07/2005 06:03:39 PM The upgrade application ‘Exchange Migration:’ returned this error: Jane Doe.: Unable to open entry

04/07/2005 06:03:40 PM Jane Doe registered successfully