One of the major headaches for network administrators is bandwidth consumption. However big your pipe into the internet happens to be, it's the last few feet from the server to the desktop that is the killer. A few years ago, people took their eye off the ball where bandwidth is concerned, as it was assumed that everyone would be migrating to the fatter cables of category 6. However, standards issues and an unwillingness to spend money in today's uncertain times means bandwidth is still at a premium. Files have not stopped growing, with multimedia data bringing many networks grinding to a halt.
Matters would be considerably worse if it weren't for the godsend that is PKZIP. Files are compressed by as much as 90 percent, allowing hefty files to shrink to more manageable and less bandwidth-hungry sizes. Probably the most ubiquitous non-Microsoft application around, PKWARE's PKZIP is probably the best compression program available - well, they did invent the Zip format.