Outlook Express can block some attachments if it thinks they might be viruses and they will appear greyed out. If you are sure you want to allow these attachments, go to Tools >Options Security > and un-tick the box 'Do not allow attachments to be saved or opened that could potentially be a virus'. Click OK. If you can access a particular attachment but can't open the file on your PC, you may not have the necessary program installed to run that type of file. You need to ask the person who sent you the attachment what program they used to create it, or ask them to save it in a more common filetype if they can.

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