问答题
You are required to write an email to your boss based on the following instructions given in Chinese. Pay attention to the format of email.
你(David Brown)办公室的电脑是五年前购置的，最近经常死机。给你的上司Mr．Vance Ballard发个电子邮件，请他更新电脑，以保证你办公室业务的正常运营。并祝他圣诞快乐。
Words for reference：死机crash down；更新update
A.
B.Vance
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