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6. No need to worry about infection
New users need to know that all that concern about viruses and malware is a thing of the past because they're no longer dealing with Windows. They won't see AVG or SEP in the notification tray, and their machine will not be at risk without them.
But it's still important to ensure users remember that their colleagues may still be using Windows, so they shouldn't be cavalier about forwarding email attachments. Just because those attachments won't harm a Linux box doesn't mean they won't damage a Windows machine.