I have played about a bit since I first posted and I now seem to be able to manage Word attachments to emails sent from the Mac on the PC. I'm not sure how this changed but it has. But I still cannot open Word documents on the Mac from a Win 7 PC on a network share. I can save these documents to the PC and edit them there though. This again is slightly different from when I first posted - then, I couldn't even save the documents. The error message has changed too. It now says nothing about permissions. Here is what it does say: "The document name or path is not valid. Try one or more of the following: *Check the path to make sure it was typed correctly. *On ther file menu click Open. Search for the file using this dialogue box. (\\Thomas's Mac\UserName\DocumentName.docx)." Clearly it's not a problem with the path because I can see the file in the network share; I just can't open it