The reason it'll be used is because it's integrated into the most widely used OS. If you don't have to download and install something separate to read PDFs then why will people bother? It doesn't matter whether it's "good". Think about Media Player and IE. People use these because they're there. If they can open their mp3s and browse sites then they're not bothered if there are alternatives (e.g. Winamp or Firefox). I'm talking about the average user here, not necessarily people who know what's best.
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The reason it'll be used is because it's integrated into the most widely used OS. If you don't have to download and install something separate to read PDFs then why will people bother? It doesn't matter whether it's "good". Think about Media Player and IE. People use these because they're there. If they can open their mp3s and browse sites then they're not bothered if there are alternatives (e.g. Winamp or Firefox). I'm talking about the average user here, not necessarily people who know what's best.