Sending a folder or a group of files
Zipping files or folders creates a file smaller than the original file. The zipped version of the files or folders has a .zip file extension.
Advantages of zipping files
  • Bundle multiple files or folders into one .zip file
  • Smaller file size drastically reduces transmission time
  • Smaller file sizes save on disk space
  • Many zip utilities allow you to encrypt files and protect sensitive data
Zipping folders/files in Windows ME/XP/Vista/2003/7
Right click on a folder, file or selection of files and click on the "Send To" menu option and then choose "Compressed (zipped) Folder".

After selecting the "Compressed (zipped) Folder" menu option, the file(s) will be zipped and you should now see a file with a .zip extension. Select the .zip file to send via SendThisFile.
Zipping folders/files using Mac OS X
Mac OS X has a feature to create ZIP compressed files from within the operating system. To create a compressed file, Control-click on the file and choose Compress. Another method would be to click on a file, then go to the Action menu (the button that looks like a gear up in the Finder window toolbar), and choose Create Archive. This action will creates a new file, with the file extension .zip. Select the .zip file to send via SendThisFile.