To provide enhanced security, Microsoft Office Outlook 2003 is designed to prevent you from unblocking attachments.
Because Outlook is so widely used, it has been the target of several virus attacks in the past that have affected millions of people. Microsoft has acted to protect people from files, such as .exe and .bat files, that are often used to run malicious scripts when opened. Unfortunately this makes file sharing less convenient for many people, but security must take precedence.
Microsoft Office 2003 file types most commonly shared between people, such as .doc, .xls, and .ppt files, are not blocked.
If you need to share files that have file types blocked by this feature, you have several options, including the following:
If your organization uses Microsoft Exchange Server, your e-mail administrator can control which file types are blocked. For more information, contact your administrator. If you are the e-mail administrator, you can learn more about configuring blocked attachment behavior in Outlook by referencing the Microsoft Office 2003 Resource Kit.