Hi, I recently purchased a second hand imac, and bought the microsoft office package for it. When I try and save the documents to the hard-drive, Word will come up with "This is not a valid file name", and excel comes up with "document not saved". The file names are standard file names such as test that I have tried saving it under. I have tried saving to the desktop and to the documents folder and both come up with this issue. I have tried reinstalling the microsoft package and I have also upgraded the operating system, neither seems to have made a difference. When I try and save the documents to an external hard-drive and face the same problem. However, it will save the documents to the time machine drive. I have used this microsoft office package on my macbook air and the documents save fine on this machine. Please could anybody shed any light on this issue for me? I know it may only be a simple preference setting but I can't seem to find the resolution.