Iâm using MS Office Outlook 2003 from the past one year now and I never had any problems associated with it. But recently iâm facing a problem that iâm having trouble opening some PDF attachments. I can open some of the PDF’s but not others. Whenever I try to open a PDF, a very plain error message displays on the screen that says “Access is denied” the title of the error window is just “Microsoft Office Outlook”. I have no idea as to what it is all about. Help me please.