Not an entirely good thing with 7zip. Let's say they download a malicious program from the internet and want to share with their colleagues, email policy will b

Not an entirely good thing with 7zip. Let's say they download a malicious program from the internet and want to share with their colleagues, email policy will block that so they will zip it up. Now their unsuspecting recipients will not get a warning about the embedded file's origins. Also, I love the fact that zone.identifier also embeds the referrer URL for the download.