Answers

2014-06-20T17:17:41+08:00
Because there are some situations that the person who are talking cant speak very well or it is more proper when you deliver it through mail. Just like in our company, we use to email our clients in order them to know our side even without proper meeting.

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2014-06-20T18:08:45+08:00
Because sometimes, documentation serves as proof or evidence for their agreement. 
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