But because Jpegs are a lossy format, by the time the files have been messed about with a few times, you can lose a lot of quality. It can be worthwhile to either send a bitmap as a zip file, or use another lossless compression method such as Tiff, or .psd for Photoshop users.

The Windows zipping and unzipping process is pretty much the same between XP, Vista and Windows 7, Sheila.