>>>Since I have upgraded to XP SP2 yesterday, I am facing some weird problems. Now, from Outlook, it doesn't accept any zip file to be attach to an email. I can't even see the file in the list. This security is bugging a lot of things. Any recommendations to resolve those issues?
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>>Check out http://www.pcmag.com/article2/0,1759,1631261,00.asp
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>This is about incoming files and not about outgoing. The problem is when I create a new email and want to attach a zip file. It doesn't want to show it in my list of files that I can select to attach. I even tried to fake the file to Something.jpg for example. That made it appear in the list as the filter is *.*. So, I selected the file and Outlook refused to attach it.

Can you attach another binary format? for example: JPG, DOC, EXE, DLL
What version of Outlook do you use?