How do I convert my existing zip files to 7z with 7-zip comand line?

Question

I'd like to convert a couple thousand zip files to 7z, with maximum compression and multithreading enabled.

Also in another place. Like c:\temp\file.zip to f:\converted\file.7z

Answer 1

Nevermind, http://www.peazip.org/ does the job just fine!

Edit: But hell, it takes way too long....