Scan to PC saves your scan as a JPEG file to your computer or as an image capture in Mac OS X 10.6/10.7.
Scan to PC (PDF) saves your scan as a PDF file to your computer or as an image capture in Mac OS X 10.6/10.7.
Scan to PC (WSD) lets you manage network scanning in Windows 7 or Windows Vista (English only).
Note: To use this feature, you must first set up WSD (Web Services for Devices) on the computer you want to scan to.
Scan to PC (Email) scans your original and attaches it to a message in your e-mail program. You can select the e-mail program you want to use and resize your image, if necessary, from an option screen on your computer.