exporting mail folders etc

  qwesaws 07:48 31 Jul 09

I have a removable disk(data bar) which I have been using to store save mail items contacts etc and on a regular basis I update I do the usual Mail/file/export/messages/windows mail then to folder then I send folder to removable disk.
but today for some reason the transfer of mail to the new folder suddenly stops and I get an error message saying message export failed an error has ocurred.
There is plenty of room on the disk and I have done a disk clean up how can I sort this out please.

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