Acrobat X Pro
Company: Adobe
Price: $449 (upgrade, $199)

PDF files have been used since 1993 to share documents with the absolute certainty that the recipient will see the same formatting as the sender. Initially at least, PDF files were created using Acrobat, sometimes directly, but more often using Acrobat to convert word processor files into PDF files. At the other end of the chain, the person reading a PDF file had to use Acrobat Reader, a small application that could be used either on its own or as a web browser plug-in.

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