Most occurrences of inappropriate use are inadvertent, and often happen because people are trying to be helpful. For example:
The first two points can expose company information to risks that are unlikely to happen in the workplace. Family members might see confidential information - few homes have the same physical security controls as offices.
The last two points are simple errors that can make e-mail less efficient, and at worst, grind an entire enterprise to a halt.
Other activities may not be seen as obvious misuse, but can cause considerable loss in terms of resources and time. For example:
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