SecureZip by PKWare (Free )

This could be useful.

“PKWare, the company credited with the creation of the Zip file-compression format, is offering free licenses for its latest program, SecureZip Standard V11, for a limited (but unspecified) period of time.”

Check out the reviews on left side of provided link.

I wonder if anyone out there has tried this: I would be particularly interested to hear whether the Outlook integration works well?