Empty attachments

[Pavarotti]

On one machine using ms outlook some of the attachments that come in is emty - shows that it is 1kb in size (should be bigger) but when you try to open it, it is empty.
At time the attachment wont even download with the mail. It is a random problem - mostly the attachments will be fine

Any ideas

 

[Pavarotti]

Ok so no one has any idea what the solution might be....