Well, for reading .PDF files, there just aren't that many alternatives out there. Nobody is going to be able to charge for a "better" .PDF reader, because Acrobat reader is free. These files are just a fact of life in the Internet age, you need to be able to read them for about everything from the documentation that comes with your new computer to the owner's manual for a car stereo that you boiught 5 years ago, and now you can't remember how to adjust the clock for Daylight Savings time.
In a business environment, you'll get .PDF files for purchase orders, invoices, and various forms.
It'd be great to just run Linux and pick up all of those things without Acrobat reader, but the software just isn't up to running Linux on many business desktops.
As an IT administrator, it basically comes down to me having to be on alert for these things, and making sure that security patches are applied as they become available.
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