Looks like you're enjoying the discussion, but you're not signed up for an account. When you create an account, we remember exactly what you've read, so you always come right back where you left off. You also get notifications, here and via email, whenever new posts are made. You can like posts to share the love. 
Join 
If you try to send an attachment that has a file type extension that is on the Level 1 restricted list, you receive a message that other Outlook users may not be able to access this type of attachment.
Only an e-mail server administrator can change this default setting and unblock certain file types. This setting is often used on an organization's intranet, not on the Internet.
Data files, such as .doc, .xls, .ppt, and .txt files, are not blocked. However, you receive an Opening Mail Attachment message when you try to open an attachment.
This message gives you the opportunity to consider the safety of the file you are opening and a chance to save the file and scan it for viruses before opening it.
To be able to send any file type by using e-mail, you can use a third-party program, such as WinZip, to package files before you attach them to your e-mail message. WinZip can create a new Outlook message and attach the .zip package for you.
In your message, you can include instructions explaining how to extract the files from the package to make it easy for recipients to access the files.
Taken from: How Outlook helps to protect your computer from viruses - Outlook - Microsoft Office Online
Edited by Ax238, 12 May 2008 - 11:37 AM.
Give credit where credit is due
