The recipient will get the files zipped together, and can unzip them either using Windows built-in unzipping capabilities, or add-on software like WinZip. This Outlook plug-in does more as well.

PKware originated the ZIP format, and SecureZIP 11 does everything you'd expect in a ZIP utility. It also integrates with Outlook to speed and secure your e-mail, and it brings public-key cryptography ...