We have installed a new Small Business Server 2008 about 3 months ago. We have noticed that we are getting the following error on some PDF attachments:"There was an error opening this document. The file is damaged and could not be repaired.". This does not happen to all PDF files sent. I even received an e-mail with two PDF's attached to it and one opened and the other did not. We are having the problem with all users on the network.