For a long time I have emailed .dwg and .pdf files to customers, with no problems whatsoever. After loading SP2 for WinXP Pro the drawing files arrive corrupted. I then tried to ZIP the files, and this only had about 40% success. I have read the Microsoft Knowledgebase concerning Outlook Express problems, but they only cover problems with incoming email. Has anyone else had this problem and solved it? If so, please share your knowledge. Thank you, John Webb